Acrobat Pro 10.12 not possible to sign a pdf with a valid cert

Hello,
Under Windows 7 x64, it's not possible to sign a PDF with a valid certificate. Clicking the sign button gives no response and no message what so ever. When using a non valid certificate as in not certified to use for signing, it is accepted and the document is signed?!
Cheers,
Andre

Hi, Daniel.  
Thank you for visiting Apple Support Communities.  
I would need a little more information on how you are adding a signature to provide a better answer.  However, here is an article that I would take a look at.  
Mail (Yosemite): Mark up attachments
http://support.apple.com/kb/PH19143
Cheers, 
Jason H.  

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