The missing thumbnails were not the only issue. When I tried to move back and forward in an EPUB by tapping on the centre and then using the arrows at the bottom - the reader just restarted. This happened every time.
It looks like something became corrupted.
So I de-authorised it in ADE and did a complete factory reset, re-authorised and reloaded all books. All is now well (navigation and thumbnails).
I would still be interested in views on what went wrong and what I might have done differently. I am a bit concerned that I will run out of authorisations in ADE if I have to repeat this.
Dave
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