The Open GL acceleration has stopped working

Hi,

I would really appreciate some guidance on this.

The other day I ran updates to 10.0.5 adding a couple of bug fixers, nothing unusual. However when I opened After Effects CS6 and Premiere Pro CS6 it told me that the system had reverted back to using software acceleration only, the Mercury playback GPU acceleration had stopped working. Ever since then my work has been crashing and every project I open tells me that Open GL and the Mercury Playback Engine will only be able to use software because it doesn't work on my machine. I am using a high spec Macbook Pro 15 with a GeForce GT 650M, I know this card supports acceleration because I've used it to great advantage for about 9 months.

Thanks so much if anyone can shed any light on this problem.

Tom