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TO me the only suspicious line in your debug output is
qt.qpa.screen: "Unable to open monitor interface to \\\\.\\DISPLAY1:" "The operation completed successfully."
It means Qt is unable to open your monitor/screen. That is probably why the viewer is not coming up. I doubt this has anything to do with configuration files, as this is not something configuration dependent, but since you say calibre portable works, you can try renaming the calibre configuration folder and see if it helps. Go to preferences->miscellaneous->open configuration folder to find the path to the configuration folder. Then quit calibre and rename that folder and then try running the viewer.
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