Edit: 

Wait I got it! I reproduced the problem! You need to deactivate the "videos" block on the view video page and reactivate the "text" block. Because when you post embedded videos using embed.ly in Froala in the united post form in the timeline, you are posting it into the default "text" field. Try that and see if it works. You can't delete the "text" block, because there is no delete button on the popup.