Since years I am using Calibre and I'm very satisfied.
Since 2 days it does not show on my monitor anymore. When I start it, it shows on the taskbar but not on the screen. First I ran a virus scan. N

othing.
I reinstalled Calibre and later even Windows, but it did not help.
Calibre does not show.
Calibre: 64bit 4.1.0
Windows: Version 1903
What to do?