Unable to digitally sign document after adding signature appearance.

I was experimenting with creating a couple of new signature appearances in Adobe.  Now, after doing this, I cannot digitally sign documents.   After drawing a signature field and selecting the digital ID, I am directed to the next window where you would select an appearaance.  Whether I select the standard appearance or one of the custom appearances, I am unable to sign the document.  Clicking the 'sign' button does nothing.  The 'Sign As' window briefly "flashes" when pressing the button but nothing happens.  The same behavior presents itself in both Acrobat DC and Reader.