So your forum is feeding information back from the database or you would have no topics to show.
Can you as admin create a post?
I'm trying to work out if the registration is the only fail or a new post or topic is also a error page.
Then i would be thinking it could be adding info to the database could be the issue.
It could be a mysql permissions problem ?
I wonder if upgrading to 7.5.8 is the way forward ?
