All of my vids have been broke dick lately, and I always take so many extra steps to make sure I submit a clean URL, it's baffling me. The "v parameter" style has failed on me every time lately.
Anyway, I've found that if you click 'share' under the video, and copy the link from there (usually looks like this h ttp://youtu.be/gWR-F7ha3tU), it's worked for me every time.