The Facts:

[Gabriel Niebler]

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David,

it is not a gpg2 problem and it is also not relatd to modern versions
of your mail programmes. In my case Thunderbird 31.2 with
Enigmail 1.7 runs just fine with GnuPG 1.4.16. I also have GnuPG
2.0.22 installed as gpg2, but I'm not actively using it. You don't need
to downgrade your Thunderbird, if it has problems signing and
encrypting mail, somthing else is amiss.

I now think you may be hitting the pinentry issue Philip Jackson
reported several months ago. There seems to be a problem specifically
with pinentry-gtk2 and IIRC that's what you're using. You're on KDE, I
believe, so have you tried removing 'pinentry-gtk2' and replacing it
with 'pinentry-qt4'? If that doesn't work, could you try using
'pinentry-curses'?

Also, what's the content of your gpg.conf? (Just do 'cat
~/.gnupg/gpg.conf')

Best
gabe
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