Which version of iBooks is your client using? Is she testing on Mac OS or on iPad?
Not sure which version, but I know she's on a Mac OS and NOT an iPad. I'm going to try to replicate the error on my end with a few Apple devices that my friends own, but haven't had the chance to do so yet. Do you have any clue at all what might be happening? Right now I'm sitting on my hands because I don't know where to begin!
Have you tried running an EPUB checker on your file to make sure it isn't actually anything on your end? Other than that I would just suggest making sure she has the most up to date version of iBooks.
Actually no, I haven't! Good idea. Can you suggest an ebook checker that you find reliable? I'll go hunt some down on my end.
Another suggestion I found is to convert the file to an epub in Calibre's Ebook Manager. Any thoughts on that game plan, Adobe Hivemind?
Whatever you do, don't touch Calibre. It will never ever help you in a conversion environment. Try running it through FlightDeck to get a sense of what's wrong with the file (https://ebookflightdeck.com/).
Thanks so much, Laura! I'll use that from now on, and I appreciate your advice on Calibre.
It looks like this might be an issue on my client's end... hopefully I can clear this up in another week or so.
So I tried running the ebook through two ebook checkers and also opened it up just fine on another iOS device (which *should* be the only thing you can use iBooks on--so why my client said she was running it on a Mac is a mystery to me). So far so nothing--there were a few errors about best use practices and inline objects that I'll tweak, but nothing catastrophic.
Any other thoughts on what might be causing this issue?
In your last post here, you also had the same problem with the cover, which I think was due to the CMYK mode settings. Now I have no idea if iBooks doesn't display cover images that are CMYK, but usually images should be RGB (or Grayscale) in EPUB in order for them to display in ADE and Nook.
Are there any other problems in the EPUB, i.e. other than the cover?