micrOdOts.org / ramblings [of the ABsurd]

This is a known problem.
The solution is to disable the offloading features in your host NIC.

The following instructions are for Linux hosts, however,

http://extreme.outervision.com/PSUEngine

Go to about:config
Change mousewheel.withnokey.sysnumlines to false by doubleclicking.
This value sets whether the wheel's speed will be as in the system settings.