I'm not so sure it's a timeshufting issue either because watching live TV is not live. I can unplug the antenna and it takes 3 or 4 seconds before the picture disappears, so there is already some timeshifting occuring by default. So why time shifting an extra second helps, I don't know.
I'm resigned to there not being a solution. Like the MP GUI flashing that I and others experience. Maybe Windows Media Center in Windows 7 may work in NZ when it's released.