It's some sort of conflict with Compiz. You can make full screen work properly by installing the package compizconfig-settings-manager, running it from System -> Preferences -> Appearance (or ccsm from the command line), going to Workarounds section and disabling "Legacy fullscreen support".
It's some sort of conflict with Compiz. You can make full screen work properly by installing the package compizconfig- settings- manager, running it from System -> Preferences -> Appearance (or ccsm from the command line), going to Workarounds section and disabling "Legacy fullscreen support".