Sorry, my comment disappeared, I'll try again. 
My Linux Mint 18.1 Cinnamon task bar did not respond to clicks from the touch 
pad. Nor did the quick-launch, the system tray, or the Menu - in short, the 
whole bottom bar of the desktop. The Menu responded to the Windows (Super) key, 
but when I clicked on it, it disappeared without responding. 
In the Welcome Screen, I clicked on Drivers, and, after the Driver Manager 
demanded my password and updated the cache, it offered me three choices of 
driver for my NVIDIA C77 GEForce 8200M G ( I don't know what that is - a 
graphics card?). On the advice in a comment above, I changed my selection from 
nvidia-304 to xserver-xorg-video-nouveau, an open-source driver. 
This ended the above problem. What problems it causes I don't know - maybe loss 
of some function I don't care about.

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https://bugs.launchpad.net/bugs/1159707

Title:
  Cinnamon panel / task bar becomes unresponsive to mouse

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