All,
I am not sure if anyone else has seen this but I was running into problems with my laptop failing to go to sleep due to problems with the Prolific driver (12-08-06) that I installed from the VEX website.
I checked the Prolific website and there is an updated copy of the driver located here:
I installed the updated driver and the laptop now goes into sleep mode.
I have tested the new driver with the IFI Loader program (v1.1.1) and the two appear to work fine together.