Annoying Screen saver/Login window/Apple LED Cinema Display Bug

Hi all,
After upgrading to 10.6.4 I have a really annoying problem.
First the relevant setup information: MacBook Pro 17 inch (2009 model), 8 GB RAM, 10.6.4, Screen saver activates after a few minutes with password protection and a few minutes thereafter the screen is put to sleep.
Here is what happens: whenever I have an external Apple LED Cinema Display connected and I move the mouse while the screensaver is activated, I am able to type my login and password, but after that in just a matter of seconds (usually 3-4 seconds) the both screens become blue and all my programs close and Mac OS X jumps to the login screen (all data that was not saved is gone, all open windows also gone). This bug does NOT happen if the Apple LED Cinema Display is not connected.
Anyone else experiencing this issue?
Best Regards,
Michael

Hello guys, thank you for answering.
Yes, the USB cable is plugged.
At the moment I'm avoiding to flash the VRAM. But I found out that restarting my system gives me access to the controls again. It does randomly stop working. Sometimes I can adjust the cinema display settings but not the macbook screen settings. In my opinion it is definitely a bug.
There is any way to submit a bug somewhere?

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