Resolution issues in mirror mode with last model of Cinema display and MBP

I have been using my MBP with a 27 inch Cinema display for the last year in mirror mode. (Both prior to Thunderbolt). Today, the cinema display is only coming up in low resolution while mirrored, but if I exit mirro mode, the reolution on the Cinema display is correct. Any suggestions on how to get back to prior state?
Thanks to anyone who responds!

Same issue here. Since upgrade to Snow Leopard, my 24 Cinema LED Display acts weird with closed lid on my Macbook. It doesn't switch on video at all, only audio seems to work. It is correctly plugged with the special power/USB cable that comes/is attached to the 24 Cinema LED. Also booting the Macbook and immediately closing the lid doesn't
No video at all!
Please help, it seems my external display has become useless...

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