I am having the same problem as viewtopic.php?f=199&t=225546 and by following the steps provided above, the issue can indeed be fixed.
To avoid this problem to happen again, I tried to find the root cause without much success, thus I would like to know if somebody would know ?
Could be caused by a buggy extension trying to write to the oc_user_group table or add permissions. Another cause could be some sort or error when editing the user group permissions.
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