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Hi all, just to say, I seem to have found a way forward.

When I upgrade to my new M3 chip macbook pro from the 2013 model, the apple photos software changed totally....and so all the coordinates that PP had for finding the media (which was nearly all on my photos library) did not work. So what I did was, labouriously but effectively, to export all the media involved in the edit, to a folder on the desktop which PP could access with ease and then just point PP at that folder ...in fact I am not even sure if I was "pointing" PP as such since the programme would often crash if I let it try and search the original locations maps for the media. Maybe PP just found the media on its own! Still, having now migrated all the media to a folder within the PP folder on the desktop, the edit is reinstated with not a single brain cell of mine used! On start up there is a messgae that there two audio correction tools that are out of date, so many of the video effects I had applied seem to be still working., which seems quite amazing! The main thing now is to get the title crawls to work in my modern edit...they are currently all frozen!