Is it not possible to paste in the tags?  We do not offer the YouTube button in the config to users on our site. 

 

Also, looking at the editor, for this reply, which icon is for embedding YouTube.  And, will the problem (removing object tags) still occur when switching between HTML and Normal, after using the YouTube button?  Meaning, can the YouTube tags only be embedded via the insert icon, and then the source cannot be viewed.