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Thanks for the help, Jon - I do have a laptop with dual video cards and had been using the integrated (Intel) one by default. I then tried opening Calibre with the other card and the editor worked!
I've kept the Intel graphics card to an older driver version because with the newer ones I have issues changing the screen brightness (it's an old laptop...), so I guess I'll have to adapt, but at least I've found a solution. Thank you and Kovid as well.
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