Severe color posterization / patches and non functioning selection and fill tools - Mountain Lion

I just got a new laptop (Apple Mac book pro with OSX 10.8 Mountain Lion) and a fresh installation of Adobe CS6 and Photoshop is practically unusable. The issues are that there is weird color banding across the full size image (it looks fine in the thumbnail preview in the ‘navigator’ tab). These bands move and change. Next, when I use the selection tool it selects weird shapes. And if I attempt to fill it, the fills are not the color, nor the transparency nor the shapes that I set. That means masks can’t be used and pretty much no editing is possible. Some blog posts describe a similar problem, and propose changing the ‘Performance’ preferences – but that didn’t fix it for me. 

Funny thing...  Photoshop CS6 hasn't had a patch yet. 
There have been patches to a couple of non-Photoshop components of the whole package, but we're all still awaiting the 13.0.1 update to the Photoshop application itself.
What did this patch look like?
-Noel

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