Here is a user in Ask Ubuntu reporting what I think is the same bug: 
http://askubuntu.com/questions/459570/synaptics-touchpad-not-detected-while-switching-user-on-unity/516716
I also have that problem. When I switch to another user (like the guest 
session), the touchpad stops working.
The two commands mentioned by the bug reporter enable the touchpad for that 
user but, of course, admin privileges are required.

I'm using an Acer laptop with a Synaptics touchpad, Ubuntu 14.04 and lightdm 
(not gdm).
The bug doesn't affect my wireless mouse.
Also, the symptoms change when I start the guest session though lightdm vs 
directly in the top right cog menu or when I disconnect my mouse before 
starting the guest session.

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https://bugs.launchpad.net/bugs/1247388

Title:
  Mouse cursor disapear / mouse stops working, when switching user

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