Back to your old habits I see, I thought you'd had an epiphany, read what the OP wrote
Quote:
Windows 10 failure
On my Windows 10 pc with the latest version of Windows X64, no version of Calibre later than v3.48 runs (I have tried v4, v5, v6 and v7, all with the same result)
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Likely as not it's related to the usb→hdmi gadget te OP is using.