Did you figure this out #15.Crouch? I'm getting the same message as you. Could you share what you did to fix your issue if you did find it? Thank you.
I know this is an old thread but I'm experiencing the same issue as well. Using Acrobat Reader v11.0.6 on Windows XP.
I filled out a PDF via Adobe Reader and then signed the document via DocuSign and when I open the PDF to see if it validates, I get the following error: “Signature is valid, but revocation of the signer’s identity could not be checked”.
I've tried reinstalling Reader and the issue still exists.
What's interesting is that in Acrobat at home on my Mac, the same file validates just fine.
Any help would be appreciated.
Here is a photo of the issue: