[Fidney]

Thanks for the replies BetterRed and chaley.

I tend to use the "Save to disc" option when I've changed the cover of the book as in most cases that seems to make my new cover stick without reconverting (which I don't like to do unless there is any other option). I save it to disc, delete from my library and then re-add it.

A couple of my custom metadata fields - Awards & Source - were created as "Text, column shown in the tag browser" but then I discovered option to create custom fields as "Comma separated text, like tags, shown in the tag browser" so removed them (I couldn't change the settings) and then re-added them.

I will back up the library as suggested and try to do some surgery on my custom metadata fields.

Good to know that I haven't irretrievably screwed something up.

Thanks for the help.