Important Update: Apple’s OS X Mavericks 10.9.2 update (released the last week of February 2014)  fixes this problem for the 2011 ATI GPUs found in many 2011 Macs. Also the new 2013 Mac Pro was apparently never affected by this problem and works correctly on both 10.9.1 and 10.9.2.

Customers on 2011 and 2012 Macs that have ATI GPUs should update their Macs to 10.9.2.

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Continue reading OS X Mavericks 10.9.1 and ATI GPUs – Big Problem (Fixed by OS X 10.9.2) →