[Wake up CALL]

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This is driving me crazy, when I'm multitabling (using two monitors, don't know if that's relevant) 3 or 4 tables sometimes I don't get a reminder beep when it's my turn to act and my hand is folded. This seems totally random, any ideas? The only thing I can think of is if it goes off whilst another table is already beeping and so it's missed.

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If you are using an nvidia graphics card it is easy to disable a minor setting and cause your problem. Try disabling the special settings features for a short while and see if your problem is gone.