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Like I said before, I remember seeing this issue described before however I never saw a definitive explanation or cause. However, with 4.0 there are some changes on Blizzard's end occurring that should correct this problem whatever the cause is save file corruption. It looks highly likely that the 4.0 pre-Cataclysm event patch 4.0.1 will be deployed this Tuesday.
If you have this problem after that patch, then there is something very curious going on. In regards to possible cause #1, it is possible that in some rare situations that the Blizzard addon code itself is causing the issue by changing a value inadvertently and causing the nil error. Again, even if this is the case, 4.0 should take care of it.
So at this point I would say turn off Display Lua Errors in the help section of the Blizzard interface options and suffer with the error until patch 4.0 hits the live servers and then see what happens.
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