If your crash is caused by the changed font, change the font back to the default settings. (Use the restore defaults button in the viewer configuration or delete viewer.py in the calibre config directory.
And note that a StackHash fault module means that windows could not determine what module the fault occurred in. So it is pointless googling for it, since any suggestions you get will only work if the underlying cause of the crash is the same, which is unlikely.
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