Cannot digitally sign documents created with Adobe Acrobat X 10.1.4

The document is created using Acrobat X 10.1.4 Standard
I save it as an Extended PDF. Signing is verified as being allowed.
When I open the file in Reader, signing is disabled.
This worked just fine 2 months ago. What changed?
Any help would be greatly appreciated...

Unfortunately, Acrobat Standard does not include the digital signature usage right when it Reader-enables a document. You'll need Acrobat Pro for that. Note that it shows in Acrobat that signing is allowed, but it won't show the same thing in Reader. That's because signing is allowed in Acrobat unless restrictions are in place.

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Cannot digitally sign documents created with Adobe Acrobat X 10.1.4

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