"Ajax Error: Status = -1 : transaction aborted"
I get that in my firebug console sometimes. Basically, I use quick-reply to reply to a thread and I submit the form, then it just sits there. The page isn't updated, nothing changes. So I cut all the text from that quick reply and refresh the page. Magically my post shows up.
Not sure if this is a vB bug or not, but thought I'd let you know.