Have you tried exporting it as a self contained ePub first and tested it with an epub checker such as this one? pagina GmbH Publikationstechnologien: EPUB-Checker
I think it would be a first step to finding what the culprit might be...
It seems you are not the first to have had this problem.
Unfortunately, I would be able to help you any further, since I have never encountered this problem.
But at least now, you know of a great tool to verify your ePubs! ;-)
I think if you do a search here in the forums, you might find some responses that might help.
Some people suggested it could be size related (file too big?)
Hope someone else here can bring you a definite solution.
Sorry for not being able to sort it out with you,
Have a great day,
Derek, it is definitely mine as well, I couldn’t do without it anymore!
But since Pagina’s checker is free, I thought it would be a good starting point. :-)
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In the Troubleshooting Guide, Error 23 is called a temporary server error. Try it again later is the advice.