Thunderbird does not show number of unread messages on launcher icon

[Jan Henke]

Thunderbirds launcher icon shows no number of unread messages. Integration with the messages menu works (the letter symbol is correctly becoming blue). System is updated from 12.10 and it worked correctly before the system upgrade.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Saikrishna Arcot (saiarcot895)]

There's a partial solution to this: "slide" the Unity launcher icons up, and let go. Here are the steps:
1. Move your mouse to the launcher icons area (it can either be on one of the icons or in an empty area)
2. Hold down your mouse button and move up or down. Don't hold down too long without first moving the mouse; otherwise, you'll be moving one of the icons.
3. Let go.

This works for me, but I have to do this every time I start my computer.

[Adolfo Jayme Barrientos (fitojb)]

/me thinks this may be a duplicate of Unity bug #1176490

[Dmitry Shachnev (mitya57)]

Yes. Marking as duplicate of bug 1176490 as it has more info.