I would theorize its the BMD drivers. When CS6 was developing Adobe Transmit (the new code allowing external devices like Kona to more easily get hooks into the Player). BMD seems to have more trouble then AJA.
As someone running CS6.02 on a HP Z820 PC I can say the the Kona runs as expected. No frame delays to the external monitor. No audio issues.
With AJA and Adobe products, you now dont need to use any special sequences. Just the regular old Adobe sequences will now playback with full CUDA goodness and display on my external engineering monitor.
I dont care for BMD so have no experiences to share regarding their products. Sorry.
Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com
https://www.youtube.com/watch?v=DxPrG3WUyz8
(Best viewed at 1080P and full screen)
HP Z820 Dual 2687
64GB ram
Dulce DQg2 16TB raid