Thanks for all the replies.
I have tried Safe Mode (which worked), but I've also tried disabling all services and startup apps (which didn't).
I had seen the suggestion to set QTWEBENGINE_CHROMIUM_FLAGS before, but I thought that was only for the book viewer so I didn't try...I will try it.
The window is not showing off the screen.
The graphics card is an old Zotac GeForce GTX 1060 and I'm using the following driver (though I have also tried an old one from earlier in the year when Calibre was working):
GeForce Game Ready Driver - WHQL
Driver Version: 566.03 - Release Date: 2024 October 22
So far the only 2 things that have worked for me are Safe Mode and disabling the display adapter (which is my current solution as it can be done with Powershell very quickly).
Thanks again, and thank you Kovid for an excellent application.
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