I'm getting (presumably) the same bug as other people - which is that sometimes when I post it brings up the screen with the little blue box that says "there was an error". Sorry I didn't screenshot it, I'll try to remember that again for next time.
FYI - I just hit back, and when I get back to the composition screen there is that little red warning that says "someone else posted while you were blathering on". When I look down that someone is me! So I haven't been multiple posting (that I know of), but I can understand why some people have.
Sorry there isn't a lot of specific detail here, but it has happened both times in the "what faith are you" thread in P&R if that helps (it hasn't happened in any others for me), and presumably Xam has the same or similar bug in that thread.