diff --git a/Cargo.lock b/Cargo.lock
index 869c70c..2fcf109 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2687,7 +2687,7 @@ checksum = "d231b230927b5e4ad203db57bbcbee2802f6bce620b1e4a9024a07d94e2907ec"
 
 [[package]]
 name = "plascad"
-version = "0.7.3"
+version = "0.7.4"
 dependencies = [
  "bincode",
  "bio",
diff --git a/Cargo.toml b/Cargo.toml
index 42953bc..48e5c4a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "plascad"
-version = "0.7.3"
+version = "0.7.4"
 edition = "2021"
 authors = ["David O'Connor <the_alchemist@fastmail.com>"]
 #description = "Tools for plasmid and primer design, PCR, and related."
diff --git a/src/gui/autocloning.rs b/src/gui/autocloning.rs
index e2b570c..15fd1dd 100644
--- a/src/gui/autocloning.rs
+++ b/src/gui/autocloning.rs
@@ -104,7 +104,7 @@ fn backbone_filters(filters: &mut BackboneFilters, ui: &mut Ui) {
 }
 
 pub fn autocloning_page(state: &mut State, ui: &mut Ui) {
-    ui.heading("Assisted cloning");
+    ui.heading("Assisted cloning (Work in progress)");
     ui.label("For a given insert, automatically select a backbone, and either restriction enzymes, or PCR primers to use\
     to clone the insert into the backbone.");
 
diff --git a/src/main.rs b/src/main.rs
index c325c85..2c3796c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -503,7 +503,7 @@ impl Default for State {
             restriction_enzyme_lib: Default::default(),
             backbone_lib: Default::default(),
             reading_frame: Default::default(),
-            volatile: Default::default(),
+            volatile: vec![Default::default()],
             search_seq: Default::default(),
             backbone_selected: Default::default(),
             cloning_res_matched: Default::default(),
@@ -637,6 +637,10 @@ impl State {
 
     /// Identify restriction enzyme sites in the sequence.
     pub fn sync_re_sites(&mut self) {
+        if self.active >= self.volatile.len() {
+            eprintln!("Error: Volatile len too short for RE sync.");
+            return;
+        }
         self.volatile[self.active].restriction_enzyme_matches = Vec::new();
 
         self.volatile[self.active]