I got 500 internal server error twice now when posting in this thread. ISSOtm reported seeing the same thing. The post was successfully submitted though. I did try to make a test reply in the test forum and didn't get a server error then, so maybe the error is localized entirely within my thread. Since the post was otherwise successful, maybe there's a problem with the redirect back to the thread?
viewtopic.php?f=12&t=19164
viewtopic.php?f=12&t=19164