If you have Photoshop CS5, Adobe strongly suggests you upgrade immediately to Adobe Photoshop 12.0.1; the update addresses a number of “high priority†bugs, Adobe said.
These include issues with 64-bit Mac, performance, user interface, type, content-aware fill, HDR, 3D, painting, GPU and Liquify implemented after Adobe Photoshop CS5 and Photoshop CS5 Extended (12.0.0) were released.
The update is a 15.5MB zip file downloadable from their site.
[Site: Adobe]