Photoscan not using GPU :(

[somawheels]

I was pleased to see "Added GPU acceleration for image matching" in the changlego for version 1.3
However, after testing, I see my on gpu monitor shows no gpu load during image processing/matching atall. the only time its active, is when im pannig atound the 3d space in the photoscan viewport.
I have tried 1.3.1, and 1.3.0 using a 30-day trial key.
I am using a gtx 860M (optimus).
I have checked the GPU control panel settings and they are fine.

[Alexey Pasumansky]

Hello somawheels,

Can you please provide the processing log related to the image matching process and also the screenshot of GPU tab?

[somawheels]

I never new there was a gpu tab, silly me 
The problem is sorted now, all i had to do was enable the gpu in preferences.
I searched for the solution for some time and never saw any mention of it, so assumed there was a problem, but turns out the preferences were set wrong.
Thanks