Launcher Icons disappear

Some Launcher icons disappear.
I locked them but they have disappeared again after boot.

I have Ubuntu 12.04.2 LTS which I have installed today and updated.

Go in tty1 by pressing Ctrl+Alt+F1, login with your usser name and password and run next commands:

unity --reset-icons
unity --reset
sudo reboot now

After reboot, the problem should disappear.

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