Hi i had a similar problem where input from backmagic would freeze when i enabled lfg, so with a lot of playing i found by wiping prefs file and starting from scratch, enabling blackmagic first and lfg second that problems disspaeared, that show then was always stable, but any messing with the setup prefs after initial setup seemed to screw it up again, so definite bug or conflict of some sort but a little patience and it can be made work