Comment 13 for bug 500321

I'm having the same issue, also after an upgrade from v2 to v3 then trying to downgrade back to v2. Having found v3 to still have a few bugs I'm trying to go back to v2. I had the mozilla daily PPA enabled to get the newer version. I disabled the PPA and remove thunderbird-3.0 package, reinstalled normal thunderbird package. Now it segfaults. When I re-enable the mozilla daily PPA I can't install both side-by-side, as suggested, because now the daily PPA uses version 3.0.5 to replace the regular thunderbird, rather than keeping them as separate packages (which is a strange change, as it was always separate before). Any ideas? I'm kind of stuck, any help very much appreciated.