Just updated to the latest RC and I'm unable to embed images stored in the Media Library into a post.
Tested in Chrome, Firefox, and Safari.
1. Position cursor in post
2. Click Add Media
3. Select image
4. Click inset into post
5. No image is inserted.
I see this in the Firefox console:
TypeError: wp.mce.views.unbind is not a function
The steps above work if I start the process from the Text tab. But when I switch back to visual mode the image is lost and the text toolbar appears in a row above the visual toolbar.