Posts not showing up

I just made a post to my blog, and something went horribly wrong. I posted it, then went in to make some trackbacks as spam and got this warning:

Warning: Cannot modify header information – headers already sent by (output started at /home/.papina/dbunder/jadedgamer.coldmeat.org/wp-admin/admin-header.php:16) in /home/.papina/dbunder/jadedgamer.coldmeat.org/wp-includes/functions.php on line 1219

But the HUGE problem is, posts will no longer display on the site. You can see it at https://jadedgamer.coldmeat.org

I didn’t make any other changes to the site. No option changes, no new themes, no new plugins, nothing. I just made a post and everything went to hell.

What could have gone wrong? Any help would be much appreciated. We have several loyal readers and I’d hate the site to be inaccessable. My only option right now is to export the entries and comments and do a new install. I’d hate to have to do this.

Thanks again. Frustrated. ??