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kovidgoyal · 10-09-2019, 08:27 PM

Sadly, on some old computers with Windows 7 and certain graphics cards,
Qt WebEngine, the new component calibre uses for rendering in the viewer/editor
either renders blank screens or has lots of rendering artifacts. This can
sometimes be fixed by updating graphics card drivers. If that does not
work, you will have to remain with calibre 3.48 until you are able to
update Windows. Note that Windows 7 is being End-of-lifed by Microsoft in
January 2020.
Old version of calibre are available from: https://download.calibre-ebook.com/

You can simply uninstall calibre 4 and install calibre 3.48 instead, all your
books/settings/plugins will be unaffected.

10-09-2019, 08:27 PM	#2
kovidgoyal creator of calibre Posts: 43,916 Karma: 22669818 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Sadly, on some old computers with Windows 7 and certain graphics cards, Qt WebEngine, the new component calibre uses for rendering in the viewer/editor either renders blank screens or has lots of rendering artifacts. This can sometimes be fixed by updating graphics card drivers. If that does not work, you will have to remain with calibre 3.48 until you are able to update Windows. Note that Windows 7 is being End-of-lifed by Microsoft in January 2020. Old version of calibre are available from: https://download.calibre-ebook.com/ You can simply uninstall calibre 4 and install calibre 3.48 instead, all your books/settings/plugins will be unaffected.