pvr 500

[pedplar]

I have 2 pvr-500s installed in my hybrid.  I have 1 md. I am able to watch live tv on either the md or the hybrid.  but not on both.  it will only use tuner 1 of the first card.  mythtv detects all 4 tuners.  if i press change input it just stays on input 1.  any ideas whats wrong.