I can confirm this bug., on Ubuntu 11.04 x64 and thunderbird 5.0~b2+build1+nobinonly-0ubuntu0.11.04.1~mfn2 from the mozilla PPA., and launcher integration 0.6.
I can confirm this bug., on Ubuntu 11.04 x64 and thunderbird 5.0~b2+ build1+ nobinonly- 0ubuntu0. 11.04.1~ mfn2
from the mozilla PPA., and launcher integration 0.6.