10.6.8 update screen freezing on macbookpro

Since I downloaded the 10.6.8 update combo, my macbookpro has frozen 3 times and required a reboot each time. Yes, I heard it happens in Lion but it is now happening in this new update. My macbookpro never had this problem before.

Same problem here with a MacBook Pro. I have the notebook connected to a Cinema Display and thus manually dimmed down completely my MacBook Screen. Now after updating to 10.6.8 my MacBook screen dimms up at the time when it would normally dimm it down if the screen was "enabled".
I tried several steps to fix that:
- Dis- and reconnected my external Cinema Display.
- Changed display and energy safer settings in system preferences.
- Fixed file permissions.
- Did a PRAM-reset.
Nothing helped.
Please help us!

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