Twice today I got double posts, nothing to do with RWQ - just a normal reply in the quick reply box at the bottom of the page.
System: Chromium 5.0.375.99 (51029) Built on Debian unstable, running on Debian squeeze/sid
edit: To clarify, it's not actually the same problem as Tom's - I misread. The reply is posted, but then immediately an error page states "You must wait up to thirty seconds between posts, try again later" or somesuch.
oh and again, posting to this thread.