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Yep, go back to NewBB 1. Had to do this last week as so far, afaik there isn't a fix for it and may not be, as this error is not easily reproduced, and so far only a handful of us are having this issue. If you do go back to NewBB 1, remember you'll lose ALL your posts :(
Been back on NewBB 1 for over a week now, and not a problem what so ever, it's bliss (except those horrible icons, they're rancid lol)
DeZ