I've been trying to figure out this problem all weekend with no luck so I thought the experts here might be able to help.
I just got a Boxee and connected it to my AVR 591 via HDMI which is connected to my LG 42PC5D TV. Everything works on the Boxee (movies over the network, internet videos, etc) EXCEPT the Netflix app, which works intermittently. Sometimes it works perfectly after first starting up the Boxee, I'll exit Netflix then reopen it and then I get a black screen and the Boxee freezes and I have to unplug it to reboot it.
So I bypassed the AVR 591 and connected the Boxee directly to the TV and Netflix works perfectly everytime! So it appears the problem is with the receiver but I can't figure out what could be causing the problem.