first container would not come up:
Starting CT 2333:
service vz stop
OpenVZ is locked [FAILED]
2010-11-29T23:26:23-0800 vzctl : CT 2333 : Starting container ...
2010-11-29T23:37:21-0800 vzctl : CT 2333 : vzquota on failed 
vzquota : (warning) Incorrect quota shutdown for id 2333, recalculating disk usage
vzquota : (error) quota check : lstat `sess_a5078fce5f569e453ab1fb39b0fc69f8': No such file or directory
vzquota on failed 
Trying to start it again worked after a long time. The other option is to disable quota, start it and then re-enable quota.