OK - I've recreated it.
I have 2 books: an epub and a mobi -the book title is 34 characters, and the author is 23.
On the disc currently, there is no truncation, i.e the book appears as Title - Author.epub and Title - Author.mobi, in separate folders.
I select the epub file first, and then the mobi, and click merge.
When I go look at the epub folder on the disc, now there are 3 books - the original epub, and a copy with a slightly shorter title, and the mobi with a slightly shorter title.
I am unable to rename the book in calibre now.
If I delete the original (longer title) epub in file manager, now I can rename the book successfully in calibre.
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