I have an ASUS netbook, which I sometimes use to present. The other day, after connecting to the projector, the mouse pad froze, though the keyboard remains usable. Now the mouse pad freezes every time I login. I found a solution of sorts here, but I have to run the command every time I log in to free up the mouse. The projector thing could be a coincidence, but it seems a bit of an odd one.

When I log into the guest account, the mouse pad works fine, so something must have changed in my local config files. But I don't know where to start looking.