diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index d6c7afa..dbafa55 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -15,10 +15,10 @@ jobs:
   build-and-test:
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: FedericoCarboni/setup-ffmpeg@v1
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 8.0.x
     - name: Restore dependencies
diff --git a/MatroskaLib/MatroskaLib.Test/ByteHelperTest.cs b/MatroskaLib/MatroskaLib.Test/ByteHelperTest.cs
index ca7b327..5d33723 100644
--- a/MatroskaLib/MatroskaLib.Test/ByteHelperTest.cs
+++ b/MatroskaLib/MatroskaLib.Test/ByteHelperTest.cs
@@ -6,9 +6,9 @@ namespace MatroskaLib.Test;
 public class ByteHelperTest
 {
     public static TheoryData<ulong, List<byte>> TestData1 = new() {
-        { 2UL,  new () { 0x2 } },
-        { 909UL,  new () { 0x3, 0x8D } },
-        { 1_800_70UL,  new () { 0x2, 0xBF, 0x66 } },
+        { 2UL, [0x2] },
+        { 909UL, [0x3, 0x8D] },
+        { 1_800_70UL, [0x2, 0xBF, 0x66] },
     };
     [Theory, MemberData(nameof(TestData1))]
     public void ToBytesTest(ulong value, List<byte> lsBytesExpected)
@@ -19,10 +19,10 @@ public void ToBytesTest(ulong value, List<byte> lsBytesExpected)
     }
 
     public static TheoryData<List<byte>, List<byte>> TestData2 = new() {
-        { new() {0x0, 0x0, 0x0, 0x96},  new () { 0x96 } },
-        { new() {0x0, 0x0, 0x5, 0x0, 0x9}, new () { 0x5, 0x0, 0x9 } },
-        { new() {0x9}, new () { 0x9 } },
-        { new() {}, new () {  } }
+        { [0x0, 0x0, 0x0, 0x96], [0x96] },
+        { [0x0, 0x0, 0x5, 0x0, 0x9], [0x5, 0x0, 0x9] },
+        { [0x9], [0x9] },
+        { [], [] }
     };
     [Theory, MemberData(nameof(TestData2))]
     public void RemoveLeftZeroesTest(List<byte> lsBytes, List<byte> lsBytesExpected)
@@ -34,34 +34,34 @@ public void RemoveLeftZeroesTest(List<byte> lsBytes, List<byte> lsBytesExpected)
 
     public static IEnumerable<object[]> Data()
     {
-        yield return new object[]
-        {
+        yield return
+        [
             new List<byte>{ 0x6B, 0x2D, 0xAE, 0xBB, 0xD7, 0x81, 0x02 },
             new List<byte>{ 0x6B, 0x2D, 0xAE, 0xBE, 0xD7, 0x81, 0x02 },
             4,
             3
-        };
-        yield return new object[]
-        {
+        ];
+        yield return
+        [
             new List<byte>{ 0x81, 0x02, 0xAE, 0x42, 0x83, 0xD7, 0x81, 0x03 },
             new List<byte>{ 0x81, 0x02, 0xAE, 0x42, 0x87, 0xD7, 0x81, 0x03 },
             5,
             4
-        };
-        yield return new object[]
-        {
+        ];
+        yield return
+        [
             new List<byte>{ 0x81, 0x02, 0xAE, 0x42, 0x83, 0xD7, 0x81, 0x03 },
             new List<byte>{ 0x81, 0x02, 0xAE, 0x42, 0x87, 0xD7, 0x81, 0x03 },
             5,
             4
-        };
-        yield return new object[]
-        {
+        ];
+        yield return
+        [
             new List<byte>{ 0x00, 0x00, 0xAE, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0, 0x3A, 0xD7, 81 },
             new List<byte>{ 0x00, 0x00, 0xAE, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0, 0x3D, 0xD7, 81 },
             11,
             3
-        };
+        ];
     }
     [Theory, MemberData(nameof(Data))]
 
diff --git a/MatroskaLib/MatroskaLib.Test/Helpers/MkvValidator.cs b/MatroskaLib/MatroskaLib.Test/Helpers/MkvValidator.cs
index 7e84dc7..d462c1b 100644
--- a/MatroskaLib/MatroskaLib.Test/Helpers/MkvValidator.cs
+++ b/MatroskaLib/MatroskaLib.Test/Helpers/MkvValidator.cs
@@ -11,6 +11,7 @@ public static class MkvValidator
     private const string OutputRemoveRegex = @"(^At least one output file must be specified)|(^\[(.*)\] )";
     public static void Validate(string filePath)
     {
+        // Validate with ffmpeg
         Process p = new Process();
         p.StartInfo.UseShellExecute = false;
         p.StartInfo.RedirectStandardError = true;
@@ -26,6 +27,7 @@ public static void Validate(string filePath)
             throw new Exception("ffmpeg's mkv validation produced errors:" + Environment.NewLine + output);
         }
         
+        // Validate with mkvalidator
         p = new Process();
         p.StartInfo.UseShellExecute = false;
         p.StartInfo.RedirectStandardError = true;
diff --git a/MatroskaLib/MatroskaLib.Test/MatroskaLib.Test.csproj b/MatroskaLib/MatroskaLib.Test/MatroskaLib.Test.csproj
index fa88b03..4e9c1fd 100644
--- a/MatroskaLib/MatroskaLib.Test/MatroskaLib.Test.csproj
+++ b/MatroskaLib/MatroskaLib.Test/MatroskaLib.Test.csproj
@@ -49,6 +49,10 @@
       <Link>mkv files\TestFile5_MkvProEdit.mkv</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="..\..\TestMkvFiles\mkv files\TestFile6_SmallSeekHead.mkv">
+      <Link>mkv files\TestFile6_SmallSeekHead.mkv</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="mkvalidator.exe">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
diff --git a/MatroskaLib/MatroskaLib.Test/MatroskaLibTest.cs b/MatroskaLib/MatroskaLib.Test/MatroskaLibTest.cs
index dc48fd0..f39665c 100644
--- a/MatroskaLib/MatroskaLib.Test/MatroskaLibTest.cs
+++ b/MatroskaLib/MatroskaLib.Test/MatroskaLibTest.cs
@@ -13,6 +13,9 @@ namespace MatroskaLib.Test;
  *   Only first void with checksum elements
  * MkvProEdit
  *   Only second void and may need to change length of that void
+ * TestFile6_SmallSeekHead.mkv
+ *  SeekHead size of 2, which caused an exception (see github issue #10).
+ *  Do that this is not a valid mkv file accordant to MkValidator.
  */
 public class MatroskaLibTest
 {
@@ -22,7 +25,7 @@ public class MatroskaLibTest
     [InlineData("mkv files/TestFile1_MkvToolNix.mkv")]
     public void ReadTestFile1(string file)
     {
-        string[] filePaths = { file };
+        string[] filePaths = [file];
 
         List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(filePaths);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
@@ -40,12 +43,12 @@ public void ReadTestFile1(string file)
     public void WriteTestFile1(string file)
     {
         File.Copy(file, TestFilePath, true);
-        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         lsMkvFiles[0].tracks[0].flagDefault = false;
         lsMkvFiles[0].tracks[2].flagDefault = false;
 
         MatroskaWriter.WriteMkvFile(lsMkvFiles[0]);
-        lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
 
         lsTracks.Should().HaveCount(3);
@@ -59,7 +62,7 @@ public void WriteTestFile1(string file)
     [InlineData("mkv files/TestFile2_MkvToolNix.mkv")]
     public void ReadTestFile2(string file)
     {
-        string[] filePaths = { file };
+        string[] filePaths = [file];
 
         List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(filePaths);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
@@ -79,12 +82,12 @@ public void ReadTestFile2(string file)
     public void WriteTestFile2(string file)
     {
         File.Copy(file, TestFilePath, true);
-        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         lsMkvFiles[0].tracks[1].flagDefault = true;
         lsMkvFiles[0].tracks[3].flagDefault = true;
 
         MatroskaWriter.WriteMkvFile(lsMkvFiles[0]);
-        lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
 
         lsTracks.Should().HaveCount(5);
@@ -100,7 +103,7 @@ public void WriteTestFile2(string file)
     [InlineData("mkv files/TestFile3_HandBrake.mkv")]
     public void ReadTestFile3(string file)
     {
-        string[] filePaths = { file };
+        string[] filePaths = [file];
 
         List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(filePaths);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
@@ -119,12 +122,12 @@ public void ReadTestFile3(string file)
     public void WriteTestFile3(string file)
     {
         File.Copy(file, TestFilePath, true);
-        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         lsMkvFiles[0].tracks[1].flagDefault = true;
         lsMkvFiles[0].tracks[3].flagDefault = true;
 
         MatroskaWriter.WriteMkvFile(lsMkvFiles[0]);
-        lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
 
         lsTracks.Should().HaveCount(4);
@@ -140,7 +143,7 @@ public void WriteTestFile3(string file)
     [InlineData("mkv files/TestFile5_MkvProEdit.mkv")]
     public void ReadTestFile4(string file)
     {
-        string[] filePaths = { file };
+        string[] filePaths = [file];
 
         List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(filePaths);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
@@ -158,12 +161,12 @@ public void ReadTestFile4(string file)
     public void WriteTestFile4(string file)
     {
         File.Copy(file, TestFilePath, true);
-        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         lsMkvFiles[0].tracks[0].flagDefault = false;
         lsMkvFiles[0].tracks[2].flagDefault = false;
 
         MatroskaWriter.WriteMkvFile(lsMkvFiles[0]);
-        lsMkvFiles = MatroskaReader.ReadMkvFiles(new[] { TestFilePath });
+        lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
         List<Track> lsTracks = lsMkvFiles[0].tracks;
 
         lsTracks.Should().HaveCount(3);
@@ -172,4 +175,14 @@ public void WriteTestFile4(string file)
         lsTracks[2].Should().BeEquivalentTo(new { flagDefault = false, flagForced = false, language = "jpn", type = TrackTypeEnum.audio });
         MkvValidator.Validate(TestFilePath);
     }
+
+    [Fact]
+    public void FileWithSeekHeadSizeOf2ShouldNotThrow()
+    {
+        File.Copy("mkv files/TestFile6_SmallSeekHead.mkv", TestFilePath, true);
+        List<MkvFile> lsMkvFiles = MatroskaReader.ReadMkvFiles([TestFilePath]);
+        lsMkvFiles[0].tracks[0].flagDefault = false;
+        
+        MatroskaWriter.WriteMkvFile(lsMkvFiles[0]);
+    }
 }
diff --git a/MatroskaLib/MatroskaLib.Test/README.md b/MatroskaLib/MatroskaLib.Test/README.md
index 18de853..077803b 100644
--- a/MatroskaLib/MatroskaLib.Test/README.md
+++ b/MatroskaLib/MatroskaLib.Test/README.md
@@ -13,7 +13,7 @@ The unit tests depend on ffmpeg and mkvalidator to make sure the program outputs
   If you are on a Ubuntu based distro: [use this PPA](https://launchpad.net/~hizo/+archive/ubuntu/mkv-extractor-gui) to install mkvalidator  
   Otherwise: [Download the source code](https://sourceforge.net/projects/matroska/files/mkvalidator/) and compile using make.
 
-**MacOS**
+**MacOS**  
 Use homebrew:
 ```
 brew install mkvalidator ffmpeg
diff --git a/MatroskaLib/MatroskaLib/Helpers/ByteHelper.cs b/MatroskaLib/MatroskaLib/Helpers/ByteHelper.cs
index 2b40271..ab3c1af 100644
--- a/MatroskaLib/MatroskaLib/Helpers/ByteHelper.cs
+++ b/MatroskaLib/MatroskaLib/Helpers/ByteHelper.cs
@@ -57,7 +57,8 @@ public static void ChangeLength(List<byte> lsBytes, int position, List<byte> lsL
 
             // Convert new length to bytes and strip bytes
             List<byte> lsNewBytes = ToBytes(ret);
-            if (lsNewBytes.Count != lsLengthBytes.Count) throw new Exception("New length doesn't fit into existing length element");
+            if (lsNewBytes.Count != lsLengthBytes.Count) 
+                throw new InvalidOperationException($"New length bytes are not the same length as the old ones. Old length: {lsLengthBytes.Count}, new length: {lsNewBytes.Count}");
 
             // Replace old length with new length bytes
             lsBytes.RemoveRange(position, lsNewBytes.Count);
diff --git a/MatroskaLib/MatroskaLib/Helpers/CustomExtensions.cs b/MatroskaLib/MatroskaLib/Helpers/CustomExtensions.cs
index b1d9906..691c312 100644
--- a/MatroskaLib/MatroskaLib/Helpers/CustomExtensions.cs
+++ b/MatroskaLib/MatroskaLib/Helpers/CustomExtensions.cs
@@ -16,7 +16,7 @@ public static void LocateElement(this EbmlReader reader, ulong descriptor)
                 }
             }
 
-            throw new Exception($"Cannot find descriptor 0x{descriptor:X}");
+            throw new InvalidOperationException($"Cannot find descriptor 0x{descriptor:X}");
         }
     }
 }
diff --git a/MatroskaLib/MatroskaLib/MatroskaWriter.cs b/MatroskaLib/MatroskaLib/MatroskaWriter.cs
index 8806a97..d967a7f 100644
--- a/MatroskaLib/MatroskaLib/MatroskaWriter.cs
+++ b/MatroskaLib/MatroskaLib/MatroskaWriter.cs
@@ -8,7 +8,7 @@ namespace MatroskaLib;
 
 public static class MatroskaWriter
 {
-    public static void WriteMkvFile(MkvFile mkfFile)
+    public static void WriteMkvFile(MkvFile mkfFile, bool dryRun = false)
     {
         using var dataStream = File.Open(mkfFile.filePath, FileMode.Open);
         dataStream.Seek(0, SeekOrigin.Begin);
@@ -25,6 +25,7 @@ public static void WriteMkvFile(MkvFile mkfFile)
             offset, lsBytes);
 
         // Write modified changes to file
+        if (dryRun) return;
         dataStream.Seek(0, SeekOrigin.Begin);
         dataStream.Write(lsBytes.ToArray(), 0, lsBytes.Count);
     }
@@ -71,10 +72,14 @@ private static void _ChangeVoidLengthAndHeaders(List<Seek> seekList, int? seekHe
             foreach (var s in seekList.Where(s =>
                          s.seekId is MatroskaElements.Tracks or MatroskaElements.SegmentInfo))
             {
-                int desiredLength = Convert.ToInt32(lsBytes[s.seekPositionByteNumber - 1] - 0x80);
                 List<byte> lsNewBytes = ByteHelper.ToBytes(s.seekPosition - (ulong)offset);
-                if (desiredLength != lsNewBytes.Count)
-                    throw new Exception("New seekposition doesn't fit into existing element");
+                if (lsNewBytes.Count > s.elementLength)
+                    throw new InvalidOperationException($"New seekPosition bytes are bigger than the old one. Trying to fit {lsNewBytes.Count} bytes into {s.elementLength} bytes");
+                if (lsNewBytes.Count < s.elementLength)
+                {
+                    // The new seekPosition is smaller than the old one, add padding
+                    lsNewBytes.AddRange(new byte[s.elementLength - lsNewBytes.Count]);
+                }
 
                 lsBytes.RemoveRange(s.seekPositionByteNumber, lsNewBytes.Count);
                 lsBytes.InsertRange(s.seekPositionByteNumber, lsNewBytes);
diff --git a/MatroskaLib/MatroskaLib/MkvFilesContainer.cs b/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
index 9499db6..5cdbd2e 100644
--- a/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
+++ b/MatroskaLib/MatroskaLib/MkvFilesContainer.cs
@@ -8,7 +8,7 @@ namespace MatroskaLib;
 public class MkvFilesContainer
 {
     public readonly List<MkvFile> MkvFiles = new();
-    public readonly List<MkvFile> MkFilesRejected = new();
+    public readonly List<(MkvFile file, string error)> MkFilesRejected = new();
 
     public MkvFilesContainer(string[] filePaths)
     {
@@ -16,10 +16,11 @@ public MkvFilesContainer(string[] filePaths)
         MkvFiles.Add(files[0]);
         for (int i = 1; i < files.Count; i++)
         {
-            if (files[0].CompareTo(files[i]) == 0)
+            string? error = files[0].CompareToGetError(files[i]);
+            if (error is null)
                 MkvFiles.Add(files[i]);
             else
-                MkFilesRejected.Add(files[i]);
+                MkFilesRejected.Add((files[i], error));
         }
     }
 
diff --git a/MatroskaLib/MatroskaLib/Types/MkvFile.cs b/MatroskaLib/MatroskaLib/Types/MkvFile.cs
index aa538ab..4e83feb 100644
--- a/MatroskaLib/MatroskaLib/Types/MkvFile.cs
+++ b/MatroskaLib/MatroskaLib/Types/MkvFile.cs
@@ -6,7 +6,7 @@
 
 namespace MatroskaLib.Types;
 
-public record MkvFile : IComparable<MkvFile>
+public record MkvFile
 {
     public required string filePath { get; init; }
     public required List<Track> tracks { get; init; }
@@ -18,7 +18,7 @@ public record MkvFile : IComparable<MkvFile>
     public required int tracksPosition { get; init; }
     public required int beginHeaderPosition { get; init; }
 
-    public int CompareTo(MkvFile? other)
+    public string? CompareToGetError(MkvFile? other)
     {
         if (other is null)
             throw new ArgumentNullException(nameof(other));
@@ -27,11 +27,16 @@ public int CompareTo(MkvFile? other)
         {
             var track = tracks[i];
             var trackOther = other.tracks.ElementAtOrDefault(i);
-            if (trackOther is null || track.number != trackOther.number || track.language != trackOther.language)
-                return -1;
+            
+            if (trackOther is null)
+                return $"Track at index {i} does not exist, expected {track.type} with language {track.language}.";
+            if (track.number != trackOther.number)
+                return $"Track number at index {i} does not match. Expected {track.number}, got {trackOther.number}.";
+            if (track.language != trackOther.language)
+                return $"Track language at index {i} does not match. Expected {track.language}, got {trackOther.language}.";
         }
 
-        return 0;
+        return null;
     }
 
     public override string ToString() => 
diff --git a/MatroskaLib/MatroskaLib/Types/Seek.cs b/MatroskaLib/MatroskaLib/Types/Seek.cs
index 19abe44..bf3ab42 100644
--- a/MatroskaLib/MatroskaLib/Types/Seek.cs
+++ b/MatroskaLib/MatroskaLib/Types/Seek.cs
@@ -9,6 +9,7 @@ public class Seek
     public ulong seekId { get; private set; }
     public ulong seekPosition { get; private set; }
     public int seekPositionByteNumber { get; private set; }
+    public int elementLength { get; private set; }
 
     public Seek(EbmlReader reader) =>
         _reader = reader;
@@ -23,6 +24,7 @@ public void ApplyElement(FileStream fileStream)
         {
             seekPositionByteNumber = (int)fileStream.Position;
             seekPosition = _reader.ReadUInt();
+            elementLength = (int)_reader.ElementSize;
         }
     }
 }
diff --git a/MkvDefaultTrackChanger/MkvDefaultTrackChanger.Mac/Info.plist b/MkvDefaultTrackChanger/MkvDefaultTrackChanger.Mac/Info.plist
index f603d14..d812c9e 100644
--- a/MkvDefaultTrackChanger/MkvDefaultTrackChanger.Mac/Info.plist
+++ b/MkvDefaultTrackChanger/MkvDefaultTrackChanger.Mac/Info.plist
@@ -7,7 +7,7 @@
 	<key>CFBundleIdentifier</key>
 	<string>com.mikemoolenaar.MkvDefaultTrackChanger</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.1.0</string>
+	<string>1.2.0</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>10.12</string>
 	<key>CFBundleDevelopmentRegion</key>
diff --git a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/ErrorForm.xeto b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/ErrorForm.xeto
index 670a827..2ead33c 100644
--- a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/ErrorForm.xeto
+++ b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/ErrorForm.xeto
@@ -3,18 +3,24 @@
 	xmlns="http://schema.picoe.ca/eto.forms" 
 	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 	Title="MkvDefaultTrackChanger"
-	MinimumSize="370,530"
+	MinimumSize="370,570"
   	Size="370,530"
 	Padding="10"
 	>
-	<StackLayout Spacing="20" HorizontalContentAlignment="Center">
-		<Label x:Name="lblTitle" Text="An error occured!"></Label>
-		<LinkButton Text="Create issue" Click="BtnCreateIssueClicked"></LinkButton>
+	<DynamicLayout Spacing="0,15" Padding="15,5,15,0">
+	    <StackLayout Spacing="5" HorizontalContentAlignment="Center">
+            <Label x:Name="lblTitle" Text="An error occured!"></Label>
+            <LinkButton Text="Create issue" Click="BtnCreateIssueClicked"></LinkButton>
+		</StackLayout>
 		<Label Text="You can report this error by creating an issue on GitHub, please copy and paste the below box-contained text in the issue description."></Label>
 		<Label Text="DISCLAIMER: The text includes basic info about your OS, tracks of the MKV file and about where the error occured in the codebase. It does not include the filename(s). By creating an issue you consent to sharing the below text publicly on the internet."></Label>
 		
-		<TextArea Width="320" Height="150" Wrap="false" x:Name="txaExceptionMessage" ReadOnly="true"></TextArea>
+        <DynamicLayout Spacing="0,10">
+		    <TextArea Wrap="false" Height="200" x:Name="txaExceptionMessage" ReadOnly="true"></TextArea>
+		</DynamicLayout>
 		
-		<Button x:Name="btnClose" Click="BtnCloseClicked">Close</Button>
-	</StackLayout>
+		<StackLayout Spacing="5" HorizontalContentAlignment="Center">
+		    <Button x:Name="btnClose" Click="BtnCloseClicked">Close</Button>
+		</StackLayout>
+	</DynamicLayout>
 </Form>
\ No newline at end of file
diff --git a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
index 381c32f..600e904 100644
--- a/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
+++ b/MkvDefaultTrackChanger/MkvDefaultTrackChanger/MainForm.xeto.cs
@@ -58,12 +58,15 @@ private void LoadFiles()
         mkvContainer = new MkvFilesContainer(filePaths);
         if (mkvContainer.MkFilesRejected.Count > 0)
         {
+            var sourceFile = Path.GetFileName(filePaths[0]);
+            
             string rejectedFiles = Environment.NewLine + Environment.NewLine;
             mkvContainer.MkFilesRejected.ForEach((x) =>
             {
-                rejectedFiles += Path.GetFileName(x.filePath) + Environment.NewLine + Environment.NewLine;
+                rejectedFiles += $"- {Path.GetFileName(x.file.filePath)}: {x.error} {Environment.NewLine}{Environment.NewLine}";
             });
-            MessageBox.Show("The following files were rejected: " + rejectedFiles, MessageBoxType.Warning);
+            MessageBox.Show($"The following files have different tracks or the order is different than {sourceFile}: {rejectedFiles}These files cannot be processed.", 
+                MessageBoxType.Warning);
         }
 
         var lsSubtitleTracks = mkvContainer.GetSubtitleTracks();
diff --git a/MkvReadCrawler/MkvReadCrawler.csproj b/MkvReadCrawler/MkvReadCrawler.csproj
index 78a6861..e9a5c6a 100644
--- a/MkvReadCrawler/MkvReadCrawler.csproj
+++ b/MkvReadCrawler/MkvReadCrawler.csproj
@@ -1,8 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <TargetFramework>net8.0</TargetFramework>
+    <OutputType>Exe</OutputType>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/MkvReadCrawler/Program.cs b/MkvReadCrawler/Program.cs
index cb0110e..b8900ed 100644
--- a/MkvReadCrawler/Program.cs
+++ b/MkvReadCrawler/Program.cs
@@ -19,7 +19,7 @@ static void Main(string[] args)
         var mainStringBuilder = new StringBuilder();
 
         int x = 0;
-        Parallel.For(0, mkvFiles.Length, new ParallelOptions() { MaxDegreeOfParallelism = 4 }, i =>
+        Parallel.For(0, mkvFiles.Length, new ParallelOptions { MaxDegreeOfParallelism = 4 }, i =>
         {
             var mkvFile = mkvFiles[i];
             var stringBuilder = new StringBuilder();
@@ -27,12 +27,13 @@ static void Main(string[] args)
 
             try
             {
-                var lsFiles = MatroskaReader.ReadMkvFiles(new[] { mkvFile });
-                stringBuilder.AppendLine("b" + lsFiles[0].tracks.Count);
+                var lsFiles = MatroskaReader.ReadMkvFiles([mkvFile]);
+                MatroskaWriter.WriteMkvFile(lsFiles[0], dryRun:true);
+                stringBuilder.AppendLine("Track count:" + lsFiles[0].tracks.Count);
             }
             catch (Exception e)
             {
-                stringBuilder.AppendLine(e.GetType().ToString());
+                stringBuilder.AppendLine(e.ToString());
             }
             stringBuilder.AppendLine();
 
@@ -40,7 +41,7 @@ static void Main(string[] args)
             Console.WriteLine($"{x++}/{mkvFiles.Length} {Path.GetFileName(mkvFile)}");
         });
 
-        File.WriteAllText("OutputkvDefault.txt", mainStringBuilder.ToString());
-        Console.WriteLine("Done!");
+        File.WriteAllText("output.txt", mainStringBuilder.ToString());
+        Console.WriteLine("Done! Output written to output.txt");
     }
 }
diff --git a/TestMkvFiles/mkv files/TestFile6_SmallSeekHead.mkv b/TestMkvFiles/mkv files/TestFile6_SmallSeekHead.mkv
new file mode 100644
index 0000000..3912d5d
Binary files /dev/null and b/TestMkvFiles/mkv files/TestFile6_SmallSeekHead.mkv differ
diff --git a/steps-to-release.md b/steps-to-release.md
new file mode 100644
index 0000000..401ebbe
--- /dev/null
+++ b/steps-to-release.md
@@ -0,0 +1,6 @@
+# Steps to release
+- Run action [Create Release](https://github.com/MikeMoolenaar/MkvDefaultTrackChanger/actions/workflows/publish.yml)
+- Extract the MacOS zip file on windows
+- On Mac, zip the extracted .app file
+- Upload the file to the release
+- Edit the description and click "Save"