Ian, it appear that the BBC changes to add a few blank lines in the mp4. i.e. now its 640x372 instead of 640x360. This causes playback issues for at least AppleTV and XBMC on XBOX. The problem appears to be there for all modes flashstd and better. The new flashlow mode strangely does not have these extra lines and therefore plays back OK. iphone mode is also ok.