A reader had problems with a Sony device (
https://www.mobileread.com/forums/sho...d.php?t=139366) and Forge of Stones. Smashwords creates the various e-book formats from a Word document.
As you can see in previous posts, I had to make many changes and corrections in the formatting to ensure that the book would be accepted in the premium distribution channel, so as far as Smashwords is concerned, the files are fine.
If anyone is having trouble with a specific file, all one has to do is mail me with their device details and preferable format and send you a tailored e-book, using Calibre, and if all else fails, a PDF of the paperback version.
I hope such problems are the exception, and not the rule.