" No, its not a bug, but it is/was a commonly made mistake when updating from pevious versions to 2.0.3 (or higher). If you don't run the update file xor forget to make the appropiate changes certain files, you get a problem (reason is: the db-field usergroupID changes to auto-increment in version 2.0.3 and following)."
Perhaps a problem introduced in the 6.0 -> 6.5 port which took 2.0.2 of phpBB2 and upgraded it to 2.0.4, no?
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