UBB.threads PHP Forum Software Community Forums UBB.threads 7 Bug Reports member not being create on Table: USER_GROUPS

I'd first double check your Member Management -> Registration Settings to make sure that the proper default group is checked.

You can go into member management, search for all users and use the change groups option. You can then choose to add everyone to the Users group and it will do so if they don't already belong to that group.