I use FCP7 through a Decklink Extreme 2, generally to an SDI monitor or deck. All system, application, and driver software are at latest. My setup using SDI is stable and happy.
Recently had to output to BetaSP BVW-70 deck via component or composite output. Only the green channel appears. Red and blue are dead. Confirmed this through component monitor. Control panel is set properly. When set to composite output, screen is black with no sync (as indicated by monitor)
Uninstalled and reinstalled BM driver. Powered down and reseated card and breakout cable. Swapped out component cables. No success.