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I had the same problem with my Cybook Opus. When trying to open some epub files, Opus restarted back to library. In my case problem was "too big" cover images as Flinx suggested. Some publishers uses pictures with resolution for example 1400x2112 and that seems to be too big for Opus to handle. Cybook Frontlight opens those books without problem.
I replaced cover photo in Calibre (right click - edit metadata) and converted book in Calibre (epub to epub). When I sent new file to Opus I was able to read book without problems.
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