Comment 1 for bug 905455

I just had a play around with this, with plank in debug mode, and it seems that plank only looses thunderbird's running application indicator when thunderbird is restored from the messaging indicator and ONLY when there is a new message in INBOX (not any other folders, such as my launchpad folder) and ONLY when thunderbird is restored from INBOX. However, the debug log shows an error of some sort (see last two lines below) preceding this event and no further messages regarding the event in-question. So this could all be coincidental.

[INFO 19:15:05.439840] [AbstractMain:182] Plank version: 0.2.0.467
[INFO 19:15:05.440331] [AbstractMain:189] Kernel version: 3.0.0-12-generic
[DEBUG 19:15:05.582580] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/theme/hover.theme'
[DEBUG 19:15:05.643821] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/settings'
[DEBUG 19:15:05.645990] [DockItems:146] Reloading dock items...
[DEBUG 19:15:05.651738] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/eog.dockitem'
[DEBUG 19:15:05.653859] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/keepassx.dockitem'
[DEBUG 19:15:05.655302] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/home.dockitem'
[DEBUG 19:15:05.658010] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/firefox.dockitem'
[DEBUG 19:15:05.659754] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/thunderbird.dockitem'
[DEBUG 19:15:05.661640] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/beatbox.dockitem'
[DEBUG 19:15:05.662998] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/totem.dockitem'
[DEBUG 19:15:05.664333] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/liferea.dockitem'
[DEBUG 19:15:05.665976] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/dock1/launchers/empathy.dockitem'
[DEBUG 19:15:05.668401] [DockItems:173] done.
[DEBUG 19:15:05.827888] [Preferences:215] Loading preferences from file '/home/ch2lah/.config/plank/theme/dock.theme'
[DEBUG 19:15:05.843066] [DockWindow:267] dock window loaded
[FATAL 19:15:50.423099] [GLib-GObject] g_object_unref: assertion `G_IS_OBJECT (object)' failed
[FATAL 19:15:50.423508] Plank will not function properly.