I have had bad stutter since then.  It only appeared to resolve it for the few minutes I checked it at the time, but it does still occur.

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.