You should not run on mySQL5 if your scripts not 100% tested with it. My provider rollback to mySQL4. E simple script kann do a table lockup under 5 witch riuns perfect under 4. He must restart nearly every hour the SQL server. Nearle every older board scripts (not only thread) locks tables and crash the server.
User mySQL5 with threads only in an enviroment with one site so you can track down all locks and resolve them. I fear there is no mre support by Infopop/Groupee on this and you find out your own whats going wrong.
