I regularly send out documents for multiple signatures. Today I followed normal procedures but started with a new signer. When I got it back from them noone else could sign it as the Place signature was now greyed out though Properties still say signatures are allowed? I checked and the signer has Acrobat XI. I checked online found no solutions. I sent the orignal document to others they both signed and it can still be signed. Can you help find out what setting is flagged on the orignal signor's Adobe that is making it so it can't be signed after them?
You may have a PDF certified or signed with digital (certificate-based) signature. You cannot sign such PDFs with e-signature because it would invalidate the already existing digital signature.