Oh my... that *is* weird.
On this end (I'm using Firefox 3 to do my browsing) it's bringing up a blank page, and not a 500 error, but even that is a problem. LOL And truth be told, I'm stumped.
Best I could suggest is if you have threads already posted in the forum to do a backup of your database (as always...<wink>

and try uninstalling/reinstalling Fireboard. That will *probably* solve your issue, especially if it's an older version of FB. And on that topic, if it is an older version that you have, grab the latest stable build from here and install that.
Wish I could be of more help, but with any luck this little suggestion might do the trick for you.