I am using Acrobat DC, updated to latest release.
In Reader, I get the error above with "Access is denied to this file"
In Acrobat DC (Pro), the windows is grey out and application hangs.
The digital signature I am using is government issued non-exportable smart card based one. The reader used is Gemalto CT30.
Would that be a Gemalto related issue? Or Adobe related?
Note that I can' use the signature to protect an MS Word document without a problem.