I'm getting the same problem, again. My older videos run okay, but all the ones from about nine months ago will not play. I've tried it in all the different browsers, and cleared the cache several times. Still won't work.
Here is just a staff pick video that I have tried multiple times. No videos, site-wide, are working for my set up (not embeds). Link: https://vimeo.com/channels/staffpicks/78033138