Has anyone else experienced this? It doesn't happen after the VM has been started up normally - Fullscreen works fine in this situation. It appears to only occur after the VM has been paused (saving the state) and then resumed later. When Cmd-F is pressed, the screen goes black for about 5-10 seconds, then the VM aborts.
I am running OS X 10.7.3 and VirtualBox 4.1.8 r75467.
Thanks for the tip. I had given the VM 64Mb of display memory, so I tried increasing it to 128Mb (the maximum) - no difference - problem still occurs. It wasn't giving any errors about low memory before I changed it. I have also confirmed that it only happens after the VM has been suspended and then resumed later on. When it is freshly booted up, Fullscreen works fine.
Perryg - the Guest OS in this case is Windows 7 Ultimate.
Yes, a ticket was raised - here. If you intend to add to the ticket then do not forget to add a zipped log file of a failed VM session. The log file "VBox.log" can be found in the "Logs" subfolder of the VM folder.