quantal: suddenly, notify-osd doesn't show bubbles

Question

using quantal and don't see notify bubbles anymore on my desktop. Using the command notify-send, I see that if i do in the terminal notify-send -u critical Test Test, i see the bubble showing up. But if i do: notify-send -u normal Test Test or just notify-send Test Test i see no bubbles!

Maybe Do not disturb mode has been applied probably, but I don't know how/when!

$ notify-send --version 
notify-send 0.7.5

$ apt-cache policy notify-osd
notify-osd:
    Installed: 0.9.34-0ubuntu5
    Candidate: 0.9.34-0ubuntu5
Version table:
*** 0.9.34-0ubuntu5 0
    500 http://archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages
    100 /var/lib/dpkg/status

Answer 1

Try to reinstall the incriminated packages with:

sudo apt-get --reinstall install libnotify-bin notify-osd