Cannot Edit Rich Posts - Error

Hi, as in other social networks, I think it's v important for users to be able to edit their videos and images and other posts after posting. I just upgraded a test site to RC2, posted a Youtube video with a comment and then edited the comment. After editing, I received this error:

Sorry, but the content is currently not available or you do not have permissions to view the item.

Is this a bug with the system or do I need to refresh my database or make some other change to get this to work?

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