Today it's working fine! (Of course ...)
The video card is an AMD FirePro W4100 from about 7 years ago.
I do also have a problem with Firefox, it tries to show its previous windows when started, and always fails and shows a screen with a button "Restore previous session". So I click that button, and then it works. Firefox apparently needs to "settle down" with one window before it's able to restore its windows to the four screens.
As for Event Viewer, I'll take a look the next time the Edit E-book program fails.
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