I just posted a couple of replies on two different threads, and when I go and look at the threads, it looks like all my posts (even older ones) are doubled. That is, it looks like all my posts got submitted twice (exact same posts). Strange.

That is very strange.  I haven't noticed any double posts... you're saying some bug is displaying your posts twice?  Post links if you want me to have a look.

All posts appeared doubled in my browser (firefox), however now I only see it as single threads. So, it might have been some weird firefox glitch. Sorry, I think it was likely a browser error as opposed to a forum error. It certainly was bizarre though! I don't know if anyone has experienced something similar before?