Thanks. I don't think it is a problem with my Mac, it is more a problem with the TeXLive software I installed on my Mac (where TeXLive has both PC and Mac versions).

That being said... There is this thing on my Mac called 'repair permissions'. If the permissions are all good then you don't get the option to do that, though. But... I am getting the option to do that so I'll do it and see how far I get.

Uni has actually been quite promising with their response. I got told to ask my local support people (to make sure I wasn't stepping on toes in going around them) and if they were unable to help then to let these other people know.

Fingers crossed :-)