For some reason, Thunderbird's new mail notifications are no longer appearing at the top right of my screen. I hear the pop sound of new messages, and Unity's Thunderbird icon receives a red number indicating the number of new messages.
But no Ubuntu notifications at all.
This seems to have happened after my latest series of updates.
Other notifications are working, however.
Edit → Preferences → General → Show an alert
- maybe it changed for some reason? i.stack.imgur.com/elMNo.png