Cannot digitally sign Windows Speech Recognition macros

I have created five WSR macros, which I digitally signed after being asked to set up a digital signature.  When I reboot and try to create more macros I am unable to digitally sign them so I have to create them without a digital signature, and then they are ignored when I try to use them as the text I am saying is entered into WordPad instead of the text I want to enter, but the macros with digital signatures work correctly.

I have also tried pinning WSR macros to the toolbar but when I click, double click, or right click the icon I am unable to open the WSR macros so have to go back to the Notification Area and click the icon there.