Severe color posterization / patches and non functioning selection and fill tools - Mountain Lion
i got new laptop (apple mac book pro osx 10.8 mountain lion) , fresh installation of adobe cs6 , photoshop practically unusable. issues there weird color banding across full size image (it looks fine in thumbnail preview in ‘navigator’ tab). these bands move , change. next, when use selection tool selects weird shapes. , if attempt fill it, fills not color, nor transparency nor shapes set. means masks can’t used , pretty no editing possible. blog posts describe similar problem, , propose changing ‘performance’ preferences – didn’t fix me. 
that looks lot gpu driver problem.
try turning off gpu in preferences, restarting photoshop.
on machines, turning off automatic gpu switching in system prefs helps.
but apple still has quite few bugs shake out in 10.8.
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