Thanks for the FB. For reasons I don't currently understand Acrobat had encountered a DDE error and behind numerous windows I had open Acrobat had displayed the error (several times). Via Task Manager I ended every thing related to Acrobat. Now it works, e.g. Calibre allows Acrobat to open the PDF. Well actually Acrobat is now correctly working with Calibre.
Again thanks for the FB.
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