OK, type this at the console:
su <enter> to become superuser then
echo 75 > /proc/driver/w100/fastsysclk <enter>
the screen will flash and the ghosting will be gone, but it will come back again when you reboot. I think you can add the line to qpe.sh to automatically set this on bootup.
The problem was the screen refresh rate being set wrong, the above command sets it to 75, I have the same problem on cacko the last few weeks since i reflashed....