i”m having the same problem on about 7 or 8 videos that i hosted via google. it started a week or so ago. anyone knows any more on this please post. i had another test post of a short video by someone else, also hosted on google, that one plays fine. since my clips are all well over 100 megs, i am thinking it might have something to do with size, which wasn’t an issue before.
I realised that since a few days GV has changed the embedding-code when you click Embed from the webupload-form, right after the upload. Using the Embed-link from the video itself works for me now again.