I'm running the new firmware (granted on an H2O) and I have not seen any eBook getting stuck. But, I do validate my eBooks before I send them to my H2O so I know there is no technical issues with them. I use epubcheck and I have never had a problem processing.
I am on Windows and I use EPUB-Checker and I can drag/drop the ePub and any errors are displayed in EPUB-Checker's window so I can easily see what the error is and go and fix it. Most of the time (when there are any errors) it's just simple fixes.
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