Bug: break down server - after few login/ logoff

hi,

this is potential bug in newest version of JM - i try it on older versions and this problem doesn’'t exists.

Problem:

when i make few login / logoff operations in short time, server is fail, and only thing to do is kill the process and start it again, this problem exists in JM >= 2.3 and today night build

sorry for that message - today i test it again and found - bug from my site - mssql database was creating some strange locks - when i restart it all things work ok.