A month later, 2-3 hours of tech support and 2 Focusrite Scarlett 8i6's tried. Neither worked. Sending back to Sweetwater. Still looking for something that works.
Hey Jerry,
Is the computer using a Z77 or Z75 chipset motherboard?
If not, then the USB3 ports are 3rd-party add-on controllers.
These are problematic with *many* USB2 audio interfaces.
The RME units typically work... but achieve better performance using a USB2 controller (integrated into the motherboard).