Karamazovnew you are a star,and thanks for the offer of a custom-made file, but h.sie has cracked it!
I had a couple of WIP in the Library folder called cameras1.dat and 1cameras.dat and they must have been read by the prog causing that problem, and am happy to advise that i now have my zooms back
Many thanks for your patience with an old git, speak soon!
Regards