Thanks for the advice.
Exact PHP version = 5.2.5
Exact CB version = 1.4
Exact Joomla version = 1.5.23
Detailed description of problem. As described above -
Trying to update a user's profile account in back-end community builder but getting "not authorised" pop up message and account not updating. I have tried logging in to the back end as a super admin and an admin.
In CB config. > Moderation, I have set "Allow Moderators to Edit User Profiles" to "Administrators and Super Administrators only".
Need to get this working quickly - have some untidy accounts listing on my site that I need to tidy up asap.