It gets stuck for me too. Must be a problem with YouTube, not your video because it works fine the second time through.
Write to them and ask for assistance.
Hey Steve, sorry you're having the same problem. I can't find contact for support ANYWHERE. Been calling / foruming / nothing. Have you ever had any luck contacting google?
Getting in contact with Google or Youtube is hopeless.
Export or just upload again to YT.
Sadly doing a new export and upload does not solve the problem. Upon upload it works fine, and will for hours. Then it kicks in. I don't understand it.
I've tried various formats and codecs, we'll see what happens. It's a pain in the butt to have to wait hours just to test it though.
FOUND A FIX:
Go in to 'Advanced settings' when editing a video and disable '3D video'.
That did the trick. Hope it works for anyone running into the same problem.
That kind of makes sense.