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Nook is probably running your EPUB file through EPUBCHECK, which is OCD that way. EPUBCHECK is OCD about no-spaces in every kind of file name, as a matter of fact. So if you put a logo on your title page, you can't call it "My publisher logo.jpg." Nope, you have to name it as, and your HTML has to call, "Mypublisherlogo.jpg."