At this time, we're investigating the problem and looking for a solution.
If you've encountered this issue while converting your file, we suggest attempting to create and upload an EPUB directly to our system.
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We've also created this Forum Thread. Post questions here and we'll do our best to respond and assist.
How will I know?...
Published a new ebook the other day. Had to revise it for some "issue" and resubmit it. Never having published an ebook before will I get a confirmation email that the "issue" has been properly fixed, the ebook was accepted and put into distribution? Or do I have to just bite my nails, wait, and see if it starts showing up in ISBN searches?