In the Readme file for PU12 it says "Due to the CAT defect in 3ds Max 2012 Product Update 11, it is no longer available." and should be uninstalled. It's not too easy to find, or a lengthy explanation but at least there's something. All those utilizing CAT should take a look.
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Autodesk asks Max 2012 users to uninstall Product Update 11
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