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Are all 3 computers running the same Operating system?
Since the 1 is not working correctly is the one most used, does it have different programs on it (from the other 2)? Did you check the file associations for ePub? Are all 3 computers trying to access the same files at the same time? Did you run a virus scan - just in case?
I'm just a novice here, but I check a lot of things when I run into computer issues.
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