Thanks for helping me to understand. I was able to duplicate the same error with those two videos. I don't know why it is happening yet, but I did find a workaround.
I'll look into the issue further to try and figure out what is going on, but in the meantime if you need to get a video posted with captions you can do so by going to the YouTube page, click "Share", click "Embed" and then copy the Embed code. Doing this the captions should show up.
Then in Canvas you edit your page and click on the "HTML Editor" where you can add the embed code. That is an ugly workaround though so hopefully we can figure out why it is happening using the "Link to URL" code!
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