Steps:
Connect 2x Magwell USB capture cards with live sources to the computer.
I am using these ones -> http://www.magewell.com/usb-capture-sdi
Find the "XI100DUSB-SDI Video" in the sources list.
Load to a empty clip cell and lanch.
Result:
Entries in the sources list does not have a number suffix like in 5.1.4.
And all instances in the deck will launch source1/cam1. Camera 2 is not available.
Thanks guys, hope you can work this one out

Audun Notevarp, Warp Visuals