I've just started the process of migrating my fairly small vBulletin 3.8 forum to XenForo. This is my first XenForo install, and I’ve hit a problem with permissions. I noticed it after some of my users imported with permissions that aren't quite right. I can correct the permissions problem and get it all working, but there's an underlying problem that needs correcting before I can go any further. When a user tries to view something they don’t have permission for, the forum display just corrupts like this: To try and boil the problem down to the basics, I’ve done a new install with nothing imported, no add-ons installed, no styling and nothing changed in the Admin CP. I created a new user though the front-end, made a single post, and it all worked OK. I then log in as an Admin and remove the View permission from the User Group, and the user gets a corrupted screen as above when they next log in. If I change the permissions back, it works correctly again. I’ve tried exactly the same thing using XenForo’s demo on their website, and that handles it correctly, showing a message saying “You do not have permission to view this page or perform this action” when the user without the correct permissions logs in. I guess I’m either making a basic mistake with the install, or there’s something at server level not working as it should. Any suggestions how I can go about locating the problem?