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Sleeping your machine may be involved, but that doesn't seem to be necessary for the bug to appear. As I mentioned earlier in this thread, I put my MBP to sleep at night, but I've seen this problem occur even in the middle of the day, hours after having been woken from sleep.

What makes this issue particularly troublesome is that it's so intermittant and unpredictable. I'll go weeks without seeing any related problem and then it'll suddenly appear again. But then, when it does appear, I can never reproduce it a second time.