I had recently moved to a new server and since then, I have been facing problems. Sometimes, when I open certain threads, I see this error. Further down, there's a vBulletin message that says This happens to my users too, but sometimes they see this error where I don't and vice-versa. (I see this in the admincp too, when I try to search for users.) First I thought this was a problem with the vBulletin files. So to confirm, I uploaded the same files on a free host along with the same database and I had the same issue. Then, I uploaded an older database with the same files and saw that everything was fine! So now I know that there was some issue with the database. I tried to repair and optimise it, but it didn't help. I even tried to change the style but I had the same problem again and I also disabled all the plugins. No help. Now my best guess is that I need to continue with the old database and ask my users to register again. This will not be good for my website. So my real question, is there a way to only add the users and their relevant information from the new database to the old one? Somebody please help, this is urgent.