Rated 1 out of 5 stars

Enigmail has always worked perfectly until now - 2.1.4 version. Apparently installs but no menu on main page, only when writing email. No installation wizard. Apparently finds gnupg (v2.*) and will list keys but cannot select one to use even
though key data is shown. Requires and cannot find certificates for encryption and signing rather than appropriate keys (trying to use SSL/TLS by mistake?) and no way to load or select keys, only certificates. Totally useless as is. (Posted here because sourceforge didn't work)

This review is for a previous version of the add-on (2.1.4). 

I believe that you ended up in the "pEp Junior Mode" (even though there should be a menu on the main page). Open the Thunderbird preferences, switch to the "Privacy" tab and select "force using S/MIME and Enigmail".

Your keys can be configured in the Account Settings.