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I've gone through permissions and allowed Guests to post and reply to certain boards. However, Guests are only allowed to make a topic. When they try to reply on their topic, they get an error saying "The following error or errors occurred while posting this message:" But it doesn't what the errors are. When trying it myself after double checking permissions for the board and guests, the error occurs when the guest is making their second post of that session. Is there a work around or any fix for this?

Have just fixed this issue!