Since this bug was Confirmed and subsequently comments https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/862497/comments/10 and https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/862497/comments/11 by separate users indicated that it is fixed as of an update, I am marking this bug Fix Released.
If anyone is still experiencing this bug, please post with details.
Since this bug was Confirmed and subsequently comments https:/ /bugs.launchpad .net/ubuntu/ +source/ thunderbird/ +bug/862497/ comments/ 10 and https:/ /bugs.launchpad .net/ubuntu/ +source/ thunderbird/ +bug/862497/ comments/ 11 by separate users indicated that it is fixed as of an update, I am marking this bug Fix Released.
If anyone is still experiencing this bug, please post with details.