If you watch a BluRay at 24p then you get the correct motion as each frame is shown for an equal amount of time on the screen (may be doubled or triple 'flashed' by the projector).. If you switch to 60p (when watching a 24p disc) then some frames get repeated (since 60 can't be equally divided by 24) and you get a judder.
It depends how sensitive you are to it, but films broadcast on USA TV NTSC do this since it's broadcast at 60i from the 24p source so you are likely to be more used to it than we are in the UK (as they just speed up 24p to 25p then interlace to 50i for PAL). I don't like 24p at 60 myself, but if you're OK with this then fair enough, since your old TV did it this way then I guess you're used to it being that way. I dofind that HDMI handshaking a bit annoying myself when going from the menu to the feature on my X35 (and HD350 before that).
"Don't believe everything you read on the internet". William Shakespeare 1615