Tried the latest nigthly build the day before yesterday (trunk-20060326-0129.dmg) and was still able to reproduce the problem.Could you download a recent nightly build and check whether you can still reproduce this bug. As far as I remember, a fix was committed on this issue a few days ago.You will see that it is about to crash when the full screen picture turns all white, then you see that little coloured ball spinning and then Poof..it's gone.
Only works if you shift between windowed and fullscreen really fast, about 10 -15times..
Still gave me a white screen and a crash report.