Ubuntu is acting really wierd after update

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http://ubuntuforums.org – Hi! I installed GTK3 the other day and then i updated and upgraded my system. I never had any problems with it before but now it's just acting bananas. The login screen wont show my background I selected (tried it several times, but nothing happens), when i have logged in, the login box shows on my wallpaper. I cant change the wallpaper or the menu bar color (which i had done before). The whole system is freezing when im minimizing firefox,banshee etc.. the whole system is really slow right now. Any idea how to fix this? Appreciate all the help I can get. Cheers / Andreas (Hardware)