Well I've done it all and nothing seems to get Visualisations running again. I have deleted MC completely, cleaned Registry, removed any Library files.... in fact the lot! Yesterday I spent 10 hours in total trying to sort this problem and I think it is time I gave up now although I am disappointed.
Clearly, from searching through MC the Visualisation files I am looking for are in situ. It just seems that something has happened to prevent MC from recognizing that they are there. Having deleted MC completely and cleaned Registry has naturally resulted in a "restore" having to be done but sadly it has made no difference.
I am puzzled about the Client machine, however, which is running perfectly with Visualisations. Considering that it is pulling information from this machine suggests that it is not a Library problem. I am STUCK!
Geoff