Acrobat Pro DC AND Acrobat Reader DC : When I choose 'Certificates' and attempt to digitally sign a pdf with my Trusted digital signature, ALL of the options are greyed out, and I cannot 'Digitally Sign' or 'Time Stamp' or 'Validate All Signatures' or 'Certify (Visible Signature)'. I can open a pdf from three years ago, and the options are available on that document only. If I keep that pdf open, I still cannot digitally sign the new document. The pdf is saved as 'enable reader' option. The certificate is Trusted. I have looked at Every Option in Options, Preferences, etc. etc. and etc. No Joy. Reader DC: 2018.011.20036. Acrobat Pro: 2018.011.20035. Windows 7 Enterprise. My IT is baffled. I am not the only one with this problem at my large institution, or across the world, it seems.
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