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This issue almost seems like a carryover from vB days as I had the same issue in vB. I'm all caught up on my forum and I move a thread to a new forum. It has the option checked notify watchers, whatever it is on the move dialog. I see the thread is bold showing as a new post yet when I click "New Posts" it doesn't show that thread in a list, nothing new. The only way I can clear it is to click mark forums read (not sure if I clicked in the thread if that would work too, probably). But seems there's a long standing but in "New Posts" not picking up a moved thread.