I'm having the same problem.
On my netbook, HP Mini 110 on Mint 12 the touchpad worked great. Two-finger scroll, and two-finger "right click" worked well. I never tried three-finger "middle click."
I couldn't figure out how to upgrade from 12 to 13, despite using the built-in update manager and running sudo apt-get upgrade. Neither worked. So I just backed up all my content and used a USB drive to fresh install a 32-bit MATE version of LM13. Everything went fine, but then I found that I didn't have the ability to right-click.
In accordance with this advice:http://forums.linuxmint.com/viewtopic.php?f=49&t=114085#p635673
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sudo modprobe -r psmouse
sudo modprobe psmouse proto=imps
After that I lost the two-finger scrolling and edged scrolling.
Also, if I try to click and drag, I completely lose control of the mouse. (as in lack of movement, not to be confused with sporadic movement)
Right click, after running that command, is just the right side of the touchpad and not two fingers like in 12.
If anyone can give any advice that would be greatly appreciated. I'm going to continue to research, and if I find the solution I'll update my post.