Thanks, theducks. Yes, I was always using Sumatra to view pdf files with Calibre. Unfortunately, choosing the 'Behavior' option is giving me exactly the same error message. Am presently doing a 'repair' . . .
Quote:
Originally Posted by theducks
Check your (they sometime glitch during updates)
Preferences: Behavior: Use internal Viewer: (I remove the tic for PDF so it uses the system viewer, Adobe Reader)
This assumes you have a system PDF viewer
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