I can watch youtube videos on my CPU, but when adding them to proclaim it doesn't work. it takes me to the proper youtube page, but on the video window there's an error that says "The adobe flash player or an HTML 5 supported browser is required for video playback."
It sounds as if your issue might be addressed here: http://community.logos.com/forums/p/47009/349417.aspx#349417
Please let me know if that doesn't fix you up. If it doesn't, please mention also what OS (Windows/Mac, and which version) you are running and which web browser you are using.