Cant connect Mission Planner to RealFlight

Is anyone having problems connecting Mission Planner to RealFlight? It was working fine and now I cant connect anymore. I am using MP 1.379 build 1.38375.24878 and a Win 10 PC runing RealFlight 9.5S. When i try to connect, it says Mavlink connecting but never does and times out, and says no heart beat packets received. Thanks, William