Internal Server Error Message

I've noticed a couple of times recently that I get an "Internal Server Error" screen when posting a message. The message actually does post, and hitting the back button and posting it again results in duplicate copies of the post. I know it must have happened to some of you as well as I've deleted some duplicate posts in the forums.

I don't know why this is occuring - there've been no changes to affect that part of the program as far as I know, and it appears to be an intermittent problem. I'll try to figure out what is causing it, but I wanted to let you know I was aware of this problem and apologize for any inconvenience or frustration it might cause you when you try posting a message...