yamaha v367 video issues

here's my setup
win 7 home prem 64bit
ati hd3450
yamaha v367 avr
vizio 47"

i have everything connected via hdmi to my avr then the avr connected to my tv via hdmi. the problem i'm having is sometimes when switching inputs on the avr when i switch back to the htpc about 1/4 of the times the video is scrambled and i have to unplug the hdmi cable from the htpc and plug it back in. i've also had the issues were sometimes when i switch inputs i would get the message about no hdmi cable connected so i wouldn't have audio i just did a firmware update on the avr and so far it's not doing that but i'm still getting the scrambled video ocassionally any help is appreciated, thanks

disregard this thread just replaced my htpc with a samsung bd-c5500 dlna works great for streaming my content off a pc and it's alot less hassle