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Thank you on your very quick answer.
I can agree on that it's qt related problem, but wander why it surfaced only after Calibre upgrade? Qt didn't change on my system. And it is GTK based, BTW. Also, as far as I can see, new ebook-viewer is the only program on my system having this sort of problem. Was the old viewer also qt based?
Thank you for the link. I checked it, but I'm afraid I don't understand it well. It mentions --no-sandbox switch, but I don't get how to use it - with what command? Command ebook-viewer does not accept it. Also, the only environment variable mentioned in that text seems to be Chromium (and debugging) related. Doesn't seem very similar to my case.
I'd appreciate if you could be more specific with what you suggested.
TIA agin and best regards,
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