@jonesgl
I've not had this issue and I just embedded six videos this evening, but I have had issues with Studio in other ways. It logs me out, it improperly sets cookies, it tries to deliver content without the correct headers, it occasionally has undefined variables in the JavaScript (this could definitely cause the problem).
You didn't give us much to go on, so let me provide some general troubleshooting.
- What browser and operating system are you using? Chrome works really well. You're using a Mac, have you updated your operating system? I've had people report issues on other things with Safari. A general troubleshooting rule is to try it in a different browser and see if it works. Internet Explorer isn't supported.
- Have you tried closing the browser and reopening it? If you're on a Windows machine, have you tried rebooting the machine (it's amazing how much that will fix when weirdness happens).
- There is another trick up my sleeve to see if it's a JavaScript error, but it's a little complicated, so I hope the other fixes it. That's to open up the developer tools in the browser (normally F12). Switch to the Console tab and then reload the Studio page. You're looking for a red box (at least in Chrome) with an error message -- most likely about something being undefined (there may be some "invalid message received from" messages -- those won't keep it from embedding).
- Are you blocking cookies or using an ad blocker? In Chrome, there's a icon at the right of the location URL that will show a red x when cookies are blocked. This picture demonstrates, but it's actually for the Community, not Canvas, because I'm blocking Twitter third-party cookies.

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