I just installed an HD Homerun yesterday, and MadVR is crashing frequently in TV (five times in the last hour). Sometimes blank screen with MadVR error window, others JRiver CTDs. Red October Standard doesn't seem to cause any crashes.
I've been using Red October HQ for a year or so and had only seen MadVR crash once or twice before this. Using most current MC version; NVidia 660 and hardware acceleration is off.