Same here, and lot of documentation here : https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/196058
Solution to get out of blocked state here : https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/196058/comments/13 (replace "fullscreen" with "normal" and adapt coordinates and sizes) but this probably doesnt prevent the blocked situation to come back.
Same here, /bugs.launchpad .net/ubuntu/ +source/ thunderbird/ +bug/196058
and lot of documentation here : https:/
Solution to get out of blocked state here : /bugs.launchpad .net/ubuntu/ +source/ thunderbird/ +bug/196058/ comments/ 13
https:/
(replace "fullscreen" with "normal" and adapt coordinates and sizes)
but this probably doesnt prevent the blocked situation to come back.