Not that I know of, cylon. I didn't see anything in their Help section regarding Intel or Macs except that OS X machines play HD better than older Macs.
It might have been an issue with Flash or javascript on your computer. I've had to reinstall Flash because of random weirdness on other websites before.
ETA: According to Vimeo's
FAQ the only system requirements are: "a fairly fast internet connection and computer". They add that "any computer made within the last three years should work fine on Vimeo."