Error copying image with bitmap select tool

Whyteboard 0.41.1
Operating System: Windows Vista (build 6002, Service Pack 2)
Screen Resolution: 1280x800
Python Version: 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)]
wxPython Version: 2.8.10.1 (msw-unicode)
wxPython Info: (__WXMSW__, wxMSW, unicode, wx-assertions-on, SWIG-1.3.29)
Python Encoding: Default=ascii File=mbcs
wxPython Encoding: utf-8
System Architecture: 32bit x86
Byte order: little
Frozen: windows_exe

 File \"whyteboard\\gui\\frame.pyo\", line 768, in on_copy
 File \"whyteboard\\gui\\canvas.pyo\", line 687, in get_selection_bitmap
 File \"wx\\_gdi.pyo\", line 659, in GetSubBitmap
PyAssertionError: C++ assertion \"Ok() && (rect.x >= 0) && (rect.y >= 0) && (rect.x+rect.width <= GetWidth()) && (rect.y+rect.height <= GetHeight())\" failed at ..\\..\\src\\msw\\bitmap.cpp(1089) in wxBitmap::GetSubBitmapOfHDC(): Invalid bitmap or bitmap region

I think I done this the other day too by somehow selecting outside of the canvas region. I thought I had code in place to guard against this. Hmm.