Not for everybody... :)
Same error here. Occurs when the game ends and data is transmitting.
Fresh install (XF Arcade 0.0.7) on test board.
PHP: 5.2.6-1+lenny9
MySQL: 5.0.51a (hm, same as by larsf)
Server Error Log:
Error Info
Zend_Db_Statement_Mysqli_Exception: Mysqli prepare error: Mixing...