Full screen mode not working for original user

Hi,

Whenever I go to start a full-screen mode in iTunes, iCal, Mail, etc. the program makes the default error sound and doesn't enter full screen. This appears in the console, but I'm not sure how to diagnose it:

21/07/11 9:11:18.253 PM Mail: ___createFullScreenMessageConnection_block_invoke_1: Fullscreen message error: Connection invalid

Furthermore, apps like Mail and Safari get interface glitches, which require a restart of the program to fix.

However, the programs work fine in full screen on other user accounts, but I don't want to have to start a new one and move ~400GB of data between them. Is there any way of fixing this? I've also tried reseting permissions.