I've been noticing a lot of server errors with Movable Type. Some investigation has determined that the MT-Blacklist plugin is the likely cause. I can't get rid of this plugin because it blocks the evil comment spam. (On a slow day I get about 30 comment spam; yesterday I got over 200.) I tried reinstalling the blacklist but that seems to have made it worse.
I'm going to try upgrading to MT version 3, but I won't have time to do that for a few days. In the meantime, sorry for all the errors when comments are posted. Generally the comment is getting posted but the server is crashing during the rebuild. In other words, there's no need to repost your comment.
you know, i actually suddenly started getting the same server errors during comment posting around the same time you did-- and i *don't* have mt-blacklist installed.
well that blows my whole theory about the cause of the errors. damn.