I've had this same problem for months now. No luck solving it. The only way I can get it to run is to reboot in safe mode and then reboot normally. The viewer will open properly...for a while. And then after a while get stuck at "Loading book...". Yes I use Bit Defender. I've had no luck turning off the features. Switching to a new AV is really not an option at this time - especially since it may not even fix the problem.
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