We've recently merged the Unity Launcher add-on into the Messaging Menu add-on, and believe we've fixed the behavioural issues in the process.
Assuming you installed Thunderbird via apt-get, if you're on the right update channel, I believe apt-get upgrade should update to include the new Messaging Menu add-on with the corrected Unity Launcher feature.
You'll, of course, need to disable the original Unity Launcher add-on for this to work.
SRoesgen:
Hey - the information definitely helps! :)
We've recently merged the Unity Launcher add-on into the Messaging Menu add-on, and believe we've fixed the behavioural issues in the process.
Assuming you installed Thunderbird via apt-get, if you're on the right update channel, I believe apt-get upgrade should update to include the new Messaging Menu add-on with the corrected Unity Launcher feature.
You'll, of course, need to disable the original Unity Launcher add-on for this to work.
Let me know if that helps,
-Mike