In reply to Alan James - Rockfax:
> It is more likely to be that the quality has increased which is why they are jumping frames. Your system may be defaulting to the higher quality HD setting. If the HD setting in the bottom right is blue then click it so that it is grey to turn off the bigger HD videos.
Agreed. My crappy laptop starts skipping frames, stuttering and generally giving sub-optimum viewing when the video is high res, especially if I've a load of tabs and other things open. It's a hardware limitation, not a software one. (same thing happens for trailers on IMDB).
However I'd also agree that Vimeo has software problems too. On my computer Firefox causes vimeo to introduce a frame from about 10 frames back every 5 frames or so when playing which makes it a flickery nightmare. Chrome solves this problem. So for anyone having problems with vimeo on their phone or whatever, try installing a different browser and see if that solves it.