What is the content of /etc/X11/xorg.conf.d/ folder? Are there any files? If yes - what content these files have?
In any case, I would not only disable, but unistall plugin first, then install the latest version of it back after the reboot.
On the other hand - This thread is a technical one, for specific hardware quirks. I am not sending you away, but there is an official thread for the touch plugin here: