Do you have access to the database? Something like phpMyAdmin will let you see the original content as stored in the database. I had a problem where extra text was in front of a very important database entry that was stopping all my posts from showing up… I fixed it by taking the crap out.
I have another problem, its crazy…. my posts are long and they ruin the layout… i’m lucky, your posts wont even show up…
How much have you customized your wordpress? I had to re-install a few times because of strange crap like this…