The icons in the notification area are sometimes broken upon login. This is always fixed if I close the session and login again.
See in this screenshot, the usual "power" button is replaced by a part of my user name. The whole username should be "agustin".
The problem is not just visual, if you click where the power button should be you get no functionality. Interestingly, if you click on the other button, and you move the cursor qith the arrow keys, you get the menu.
I believe this problem is related to the nvidia propietary drivers, but I am not sure. Any ideas? Anyone had this problem like me?