Oh what a shame Borate - little gets by you usually, but no matter.
Just playing, I went through one part resolving each issue (finding where the image actually was and opening it using the VP Resolve process) until all were working as expected. VP now knew where each image was as I had corrected the incorrect path names. Good.
Thought - now I have corrected all the path names I should be able to exit - be prompted to save as changes had been made - but NO, VP did not note all the path name corrections had been changes, and promptly exited saving nothing. Disappointed.
To solve this whole mess I have copied all the images from their own folder (where they were originally used from) to the folder in which all the clips were (where VP thought all the images should have been) and all 6 parts now load with no issue.
I am slightly frustrated as to how this could have happened as I have completed many projects using VP. For this project it has 6 parts done in chronological order and finally a credits part. Parts 1-5 were corrupt, and part6 and credits were good. So whatever happened to parts 1 to 5 did not happen to the final episodes, part 6 and credits. So my frustration is that if it was me, I don't appear to be doing it any more (good) but neither have any clue as to how the corruption occurred (bad).
For now however, life is too short to worry about how something that is no longer happening, happened, until or if it happens again.
Hopefully, unlike Arnold, I won't be back 🙂