Hai aggiornato i driver video di recente?
Qualcuno dopo aver installato i Catalyst 11.3 ha iniziato a avere il tuo stesso problema.
http://forums.adobe.com/message/3588220
Quote:
ATI Catalyst 11.3 Drivers - AVOID Using With Photoshop CS5
I recently downloaded and installed ATI's latest drivers - Catalyst 11.3 - from their web site.
In testing with Photoshop, I found these drivers have blocked Photoshop's ability to actually do OpenGL drawing in Normal and Advanced modes, even though the Enable OpenGL Drawing setting is active and checked.
I don't know if this affects all cards. I have an ATI Radeon HD 5670 card, and another user has reported the problem against a Radeon 4650.
If you have an ATI card and Catalyst 11.2 or earlier drivers, you may wish to avoid upgrading to Catalyst 11.3 at this time.
As a workaround, if you have already upgraded to 11.3, you can restore OpenGL functionality by choosing Edit - Preferences - Performance, clicking the [Advanced Settings...] button, then choosing Mode: Basic.
-Noel
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