Opensuse 12.1 64 bit

I had kde earlier and wanted to try gnome , so I went ahead and installed it looks nice though but there is an issue, whenever I use any application it does not show up so i need to either go to Activities or switch between apps and it shows up. The Activities menu works perfectly , right now I am typing on gnome and the words I type do not show up realtime hence I change between windows and then it updates the screen , Is that an Nvidia driver issue as I have the latest Nvidia driver and it is working pefrectly in kde