Cannot sign PDFs even though my Digital ID's intended usage lists "Digital Signature"

I am using Adobe Reader XI Version 11.0.12 on my PC and when trying to sign a PDF it asks me to add a Digital ID:

Even though I have a Digital ID installed in my PC, when I go check Edit -> Preferences... Identities and Trusted Certificates, More... the Digital ID is valid until 2016/10/13 and the Intended usage includes: Digital Signature, Encrypt Keys, Client Authentication.

If I try to select Usage Options there in nothing listed to select, only options I see are:

Manage Attribute Certificates and Personalize.

Thanks

Adriana