Zargg
The ASIO drivers are the drivers that came with your 6i6.
Try switching over.
I would guess that is your issue.
Zargg, buddy

I AM using the ASIO drivers that came with the 6i6. I can either access them through the DAW in Preferences or through what's called the Scarlett Mix Control (in fact, the Scarlett Mix Control is what come up inside the DAW in Preferences). They both give the same choice when it comes to numbers (1,2,3,4 etc as opposed to 128, 512 etc), but I know they are ASIO. Definitely not WDM.

JB