Ever since the recent retune of the Mediaworks channels on Freeview, I have had problems with picture breaking up on TV3. Four and TV3 +1 are unaffected. I have checked the cabling from the UHF antenna to the tuner as well as antenna orientation and connections. I'm getting near perfect signal from Te Aroha with another STB and have not had any problems in the past. I'm using Media Center on Windows 7. As it only occurs on my PC and not the STB in another room, I'm guessing this is more of a software issue than anything else.