I have successfully moved from one mac to another but with one problem.
The ip address listed in the original uploaded entries (photos) needs to be
changed to the new ip address or the photos don't appear.
While I may not have followed the rule book in making the transition,
I cannot see how the ip gets changed whatever way you make the
transition - or am I missing something? Any help greatly appreciated.

Have you tried rebuilding the site?

Yup, doesn't do the trick