Ah, nuts!
I messed something up, and braindead me forgot to do a backup.
Warning: mysql_connect(): Access denied for user 'root'@'localhost' (using password: YES) in /home/adwoff/forums/libs/mysql.inc.php on line 47
Fatal error: Call to undefined function: smartyprepare() in /home/adwoff/forums/libs/ubbthreads.inc.php on line 744
Can anyone help me out?!