this still may happen in 3.9.2 and is not a bug in the shop system. Turning on SQL Debug information was very precious to find the origin of the problem:
Error: eZMySQLDB Access denied for user 'johndoe'@'localhost' to database 'mylovelycustomer'. Query: LOCK TABLES ezorder WRITE
... well, the user hadn't the LOCK table authorization...
Hope this helps others!
Pascal
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