[pootytang]

Thanks very much for the reply. After searching for how to do what you advised, I am getting the following error message when trying to set the envir0nmental variable: "A path component can't contain any control characters nor any of the following:/*<>|

I was trying to add to either the Calibre path, or as a new item:
QTWEBENGINE_CHROMIUM_FLAGS="--disable-gpu" in Win 11 Environmental Variables.

I deleted and installed current graphics drivers without any change.

Thanks

Pooty