I have finally converted my phpbb2 forum to xenforo (90.000+ users 700.000+ posts) Converted to vbulletin first. It was a pain. It took too long, server load was very high during the convert and I had to refresh the page many times. But converting from vbulletin to xenforo was smooth. I was surprised to see server load did not change during the import and I also did not have to refresh the page. However I have some issues after the import. Of course I was not expecting an import with zero problems. Some users titles are "Guest" They are registered users but user title is Guest. I checked the database, they belong to registered users ID (2) but their styling display_style_group_id is 1 I have one user who says his nickname is changed to somebody elses nickname. This is very strange. There are a few more issues which I forgot now, but I will update the thread when I remember Finally, this is not an installation issue but, users can edit their posts but they can't edit their thread title. How can I fix this? I checked permissions but couldn't find it. Users have gone mad.