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I've had a similar problem, though not on my reader.
I had an EPUB file that I tried to edit in Sigil, but it wouldn't open because of some unrecognized tag. Calibre would view the file with no problem. To fix it, I used Calibre to convert the file to RTF, then converted back to EPUB. That wiped out the bad tag, and I was able to do my edits.
You may have something similar happening with your file. If it has some kind of "bad spot" in your EPUB file, the reader may just stop when it hits it while the programs on your computer ignore it. Try converting it to another format, and see what happens.
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