Thank you all for your input.
It was a maxing out issue. Too many Books.
I was able to establish that it did not matter the size in MB of the Images folder but it did matter the number of image files. The unit maxes out at about 7500 files. After that no image files or covers are produced.
The solution for me was to Factory reset then delete all Social image files. This dropped the number of image files to three per book (Library full, grid, list.parsed). Then delete and re-add the books with no covers. Now all my covers show.
Is there a way to stop the social image files being produced or opt out of the process ( I deleted 1,700+ of them). I am assuming that it is related to face book which I want nothing to do with.
On one of my units even a bookshelf image file started to show up. What is that? I deleted them. At one point this unit had six image files per book!
Hugh
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