I have done all this
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I am not an AMD/ATI user (only nVidia cards), but there have been some comments of some recent AMD/ATI Catalyst driver issues. Most have appeared in the Photoshop Forum.
Here are a few such threads:
Do not know if either will help you, but Noel is an AMD/ATI power-user and knows his video drivers. Also, though it does not interface with the video driver, quite as much as Premiere does, PS CS 6 makes strong use of the driver.