On ubuntu 12.04 64 bit, any change in size of Scratch's window causes it to turn black and slowly shrink down to a thin strip. Quite an interesting bug!
Here's a video: http://youtu.be/bpTX7O3NDy4
Fullscreen (via the window button - not Scratch's presentation mode) makes the window fullscreen, but there is no repaint - the window remains black until it is changed back into window mode (by clicking the rectangle). This issue also happens on my 32 bit test OS.
Here's the command I used to launch, in case it's helpful: /usr/lib/squeak/4.4.7-2357/squeakvm -encoding UTF-8 -vm-display-x11 -xshm -plugins /usr/lib/scratch/plugins/:/usr/lib/squeak/4.4.7-2357/ -vm-sound-pulse /usr/share/scratch/Scratch.image
Any idea what might have changed in the VM that could cause these issues? Could this be related to changes made for compiz compatibility?
-Amos