In the Enigmail preferences, I checked the option of using GPG-AGENT and afterwards that option disappeared completely from the preferences pane. I am now unable to use the encryption since there is never any prompt for a passphrase.
However I now wish to revert to using the old style with Enigmail/Thunderbird asking me the passphrase but I am now neither able to change it through Enigmail nor able to find the correct place to change the agent to be used.
Is there a way to get around this? I do not wish to use GPG-AGENT/Pinentry, so I really need this to work.