We have a small issue with users opening threads after a moderator closes them. Is there any way to prevent users from opening a thread after a moderator closes them?
I'd be really surprised to find out any user could open a thread that was closed by a mod. Even the OP. The relevant permission in the usergroup Manager is:
Can Open / Close Own Threads. If that really means "disregard a mod closed thread and reopen it anyway", then I suppose you'll have to disable it.