I had also the problem with cropping in Gimp, but I agree that it could be related to GTK as when I have visual effects on (compiz or whatever it is now ;-) ) the crash are much more commons than when I have no visual effects at all. It crashes when I'm trying to activate a menu, resize a window, etc. while they are still some animations going on (like the wobbling window, etc.)
I had also the problem with cropping in Gimp, but I agree that it could be related to GTK as when I have visual effects on (compiz or whatever it is now ;-) ) the crash are much more commons than when I have no visual effects at all. It crashes when I'm trying to activate a menu, resize a window, etc. while they are still some animations going on (like the wobbling window, etc.)