Try going on View > Show > All and Check all in extras options as well too. I really don't know what can solve your problem except of reinstalling the photoshop or try with drivers update.
(04-16-2011, 02:19 AM)panDa. Wrote: [ -> ]Try going on View > Show > All and Check all in extras options as well too. I really don't know what can solve your problem except of reinstalling the photoshop or try with drivers update.
Read the post before yours, he got it fixed.