Hello Dunc
I have just seen your other thread titled 'weird forums'.
https://vborg.vbsupport.ru/showthread.php?t=123568
The methods I described above work on vbullein 3.5.4 where the database has not been changed, however since you have been upgrading to 3.6.0 and reverting back to 3.6.0 R3 and looking at what you describe in your other post I cant be of any help to you. Using the admin cp on its own isnt going to be enough I feel and I dont know the admin cp of the new vbulletin upgraded forums.
You need the help from someone who knows a lot more besides backoffice permissions settings, sorry.
Karen