Well, about 75% of the time it works. The remaining 25%, the cursor goes in the opposite direction of where I want it to go.
I have an ALPS pointing device and the driver seems to be up-to-date. I have a USB mouse plugged in for when it malfunctions like this, and when I have tap enabled it tends to go crazy and tap when I'm not touching the touchpad at all.
What could be wrong with it?