I don't know if it helps but we switched hosting providers for http://cafewriter.com and after the transfer, suddenly users aren't able to post. I did a test with my Classic user account and VIP and sure enough I would be redirected to the main page after posting.

For some reason, it seems to only work when admins post on the forum, even though the database transfers were perfectly matched to the old host providers. 

Is there anything you guys might know about this sort of thing? If you need admin login info, I can PM you.

Thanks

Liana