Multi Site Stripping Out HTML

I have a site on my Multi Site network and have a user set up as an Admin. When I try to embed a youtube video or other embed code into a post or page when I am signed into his account, the code is stripped out of the post or page when "publish" or "update" is clicked.

When I am signed into the SUPERADMIN account, it does work when I add the embed video code to the html tab.

I have other sites on the network using the exact same theme, and their site works fine with this when signed into and ADMIN account.

Any Ideas?