well when i open up media portal and then go to mytv i press tv on, this takes few seconds for picture to come in the preview windows (right hand side). then i take my cursor to that window and press enter, this maximizes it. now when i go from tv1 to 2 and 3 there is no problem (mostly no problem) though it takes few seconds for a channel to settle once changed. but when i change to anything above tv 3 like maori tv or tvnz7,6 it freezes. this is strange because even in gbpvr same thing use to happen only 1,2,3 worked fine as soon as i hit c4 or tvnz6,7 it goes blank and says no signal