I have ZERO problems with Firefox. I have had that happen in the past, but I never found an answer. Sometimes, shit happens, I guess. I haven't had that problem happen often, but it has occurred. Typically, when that has happened, I was on dial up or a troublesome broadband connection. When someone transmits a data packet ( a post) there's a header included. If that header gets corrupted, the receiving end won't recognize it and simply discards it.