Usability patch: http://www.howtoforge.com/forums/showthread.php?t=60522

tbrehm

2013-02-12 36013a49f4055aeccac89858371fe12438e93c0d

1
ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;