BTW this link:
http://www.vbulletin.com/docs/html/profile
gives a "Page not found" response
--------------- Added [DATE]1398260380[/DATE] at [TIME]1398260380[/TIME] ---------------
Attempted this again, followed the instructions to the letter.
Exactly the same result.
There is a serious error and the page cannot be rendered
Would advise that users of 5.0.5 and 5.1.0 do not use this until a fix is posted.