Fri Feb 01, 2013 8:10 pm
As of 9.1, OpenCL card support (that would be AMD and ATI graphics cards and chipsets) requires OS X 10.8.2. OS X 10.7.5 didn't previously work for OpenCL cards, and now 10.6.8 no longer works with OpenCL cards.
Dwaine Maggart
Blackmagic Design DaVinci Support