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Thanks for the quick response. Everything on the system is directly out of the distro repositories, so the theory is that it is all compatible. However, that doesn't mean that an update didn't break it. I cannot find any QT 5.12.2 libraries on the system. They must have been removed during the upgrades.
I tried the three QT_OPENGL settings, and they didn't fix the problem.
The Nvidia drivers on this system are strange. Every time a new kernel is issued, the system rebuilds the Nvidia drivers from source and inserts them into the kernel. That just happened today. How all that gets disseminated to things like QT is unknown to me.
Yesterday I built PageEdit from source to see how that works. I ran it standalone and it works fine. I don't think that the build is related to this problem.
Perhaps I will try to build one of the newer versions of Sigil from source and see if it works better. That will take me a while.
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