I don't know how it works in 'clone' but I can tell you that if you 'duplicate' a tab and then duplicate the newly created tab, etc., etc., you will reach a point, rather quickly, where nothing works. That is why I now only duplicate a 'first' tab and then I can copy/paste loads, restraints, etc. without corrupting the whole model.
Thanks for answering me. But this won't work for me, since I'm finished my simulations already.
Anyway I've worked me through the forum, and I think I need to change my question:
How can I reload different projects (linked to one part)?