Try saving the copy as compact first and then try cloning the copy.
Thanks for the suggestion mr_vodka, I tried that but results exactly the same. However, I have fixed the problem
but not really solved it. A navigation script that was activated by the go to Contacts button, contained a calculation
to find the appropriate Layout. This script works fine in the original and in the compact copy but fails in the
clones. I have therefore removed the calculation and inserted the name of the Contacts Layout.
It now works properly, although I still wonder why cloning loses the plot?