URxvt resizes itself smaller and smaller until just a single character large

[pshyvers]

Enabling tabbedex (instead of tabbed, which works fine) causes URxvt to start shrinking down to a tiny size as soon as it is launched in floating window managers (KDE, icewm). This doesn't happen in the tiling manager I tested, i3wm.

I suspect it either has something to do with sizing hints or the hack to generate a configurenotify not functioning correctly.

It happens incrementally, so it seems that it is happening in small increments.

I tried switching from XMoveResizeWindow to XSetWindowBorderWidth, but I got an error and I don't really know what I'm doing.

urxvt: Can't locate object method "XSetWindowBorderWidth" via package "urxvt::term" at (eval 42) line 4.

[sliverstorm]

Here's what I see in the window that launched urxvt:

urxvt: An X Error occured, trying to continue after report.
urxvt: X Error of failed request: BadValue (integer parameter out of range for operation)
urxvt: Major opcode of failed request: 12
urxvt: (which is X_ConfigureWindow)
urxvt: Value in failed request: 0x0
urxvt: Serial number of failed request: 4107
urxvt: An X Error occured, trying to continue after report.
urxvt: X Error of failed request: BadValue (integer parameter out of range for operation)
urxvt: Major opcode of failed request: 12
urxvt: (which is X_ConfigureWindow)
urxvt: Value in failed request: 0x0
urxvt: Serial number of failed request: 4129