sign with certificate no completing sign

[Victor98A7]

after inserting a non expired, authentic (shows up in the preferences) digital seal/certificate i get a window with "back" or "sign" options.  clickiing on SIGN does absolutely nothing.  I've used it with Foxit reader and there's no problems.   

[John T Smith]

Please post the exact name of the Adobe program you use so a Moderator may move this message to that forum