GRV - 6 - Updated to 7.2.3, shift causing deck 2 to freeze

Hey, 

I just updated to 7.2.3 to try out the spotify integration, when I load a track into both decks, I can start one, but if I click shift to set one to master bpm, deck 2 will not play. The only way to get it playign again is to restart. 

I am on a high spec (9800x3d, 64gb ram) machine running windows 10 and using a GRV-6 controller.