YouTube Plugin not working

I've installed and enabled the YouTube plugin on a Joomla 1.5.23 site, and I'm using Mobile Joomla 1.0 RC3. For some reason my videos are still showing up full-size on mobile devices (servantek.org/services/tutorials/138-using-the-media-manager). Did I miss something? Is there more to it than enabling the plugin? I tried setting the "Remove unsupported tags" to yes and no, but either way, I don't see a link to the video.

Try to use www.youtube.com/embed/X0luIh514ng instead of www.youtube.com/embed/X0luIh514ng?rel=0

PS. Does youtube really add rel=0 to generated code?

Support of rel=0 option will be included in next release.

Thanks so much. It worked!