App crashes on Mac OS X

I am experiencing a repeatable crash when I switch my app from windowed
to full screen, but only when I have an external monitor attached to my
PowerBook. It produces the crash log attached.

My system is:
Powerbook G4 550MHz
Mirrored external VGA monitor at 1024x768

Mac OS X 10.2.3
SDL-cvs 2003-01-25

Does anyone have any suggestions?
-------------- next part --------------
A non-text attachment was scrubbed…
Name: crash.log.gz
Type: application/x-gzip
Size: 2064 bytes
Desc: not available