Boot camp 6 trackpad Scrolling Win10

I upgraded to Windows 10 before BC6 and everything was working fine except the function keys controlling volume, brightness etc.

I updated to BC 6 recently on prompting and successfully installed the BC6 drivers which recovered the use of function keys but has disabled trackpad scrolling. The settings has a trackpad tab and I can adjust the scrolling but it simply does not allow two fingers on the trackpad to scroll anything.

Using a USB mouse scrollwheel works. It's only the trackpad that is affected.

MacBook Pro 15" mid 2012 model.