emotionalvampire: A futher little update...I have found that even with the firewall rule disabled, sometime (like 1 in 5) the problem returns. A reboot seems to fix this. I did try enabling and disabling the rule but this had no effect, only a reboot worked
What brand of mouse do you use? Do you use the software for it? I'm wondering if the scrolling has to do with mouse drivers/software.
Both my desktop and laptop i use Logitech mice. Desktop uses the Logitech gaming software/drivers. Laptop uses the Logitech setpoint software/drivers. I'm wondering now if the game isn't fully "taking over" the mouse "calls" causing the scrolling. Windows is still calling for the input control too.
A reboot would reset the drivers and could explain the issue disappearing after the reboot.