I believe that they're complaining of the file calibre_bookmarks.txt in a sub-folder META-INF _not_ being included in the manifest (list of files) for the .epub.
Unzip it, delete that file and re-zip
or
Unzip it, find the manifest, add that file to the list, re-zip
William
(Neat that you like OS/2! I was very fond of it, and found that the machines which I sold w/ it back when I worked in a computer shop needed very little in the way of support 'cause of the clean-ness and consistency of the interface --- wish I could find a copy of OS/2 for Pens)
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