[EditorOne]

I'm working on a book that is primarily in English with some parts in Hebrew, Yiddish, and Polish. Epub conversion with Calibre (to derive expanded CSS for good display on Nook) works fine for my Nook device and for Nook reader (as well as Kobo and Google Play) on the tablet. Everything looks perfect.

My client (who did the print version of the book and contracted me to do the e-version), does not have a device to review the files so she downloaded Nook reading software for her computer. She is getting errors that do not show up on my device or in any of my software based epub readers. Specifically, certain Polish letters (those with language-specific diacritical marks) are replaced with a question mark.

I'm thinking it is a computer-specific problem or that she should uninstall the Nook reader and re-install. I need her to be confident that I have provided her with a good epub file. Any other thoughts?