When trying to add a vid I've created (and loaded to my own youtube channel) using the media upload link box via the web editor long post tab, I always get the att'd error msg IN the editor.

My experimentation shows other youtube vids load fine.

Interestingly, if it helps in any way, is that the error msg replaces the link though does not show in a Shared post.

EDIT: Long post via web editor does not allow direct upload of vids, they have to have a URL.

@clseibold