When I try to sign with my certificated signature Adobe is blocking and I must close the application only from Task Manager. I tried from two computers and is same and application CERF is open and block Acrobat . I have nothing changed in configuration an

When I try to sign with my certificated signature Adobe is blocking and I must close the application only from Task Manager. I tried from two computers and is same and application CERF is open and block Acrobat . I have nothing changed in configuration and I have signed with my digital certificate  few days ago