Hi, there is a problem with flash videos (YouTube). They are not showing if you paste just URL of that viedo (like http://www.youtube.com/watch?v=mU5W8MgtjeM for example). The editor did not show it.
In other tool like this one - TinyMCE - it is working becouse the URL is converted to this one: http://www.youtube.com/v/mU5W8MgtjeM
Other way you are forced to edit you code in your editor and paste embeded code like this:
<object width="480" height="385"> <param name="movie" value="http://www.youtube.com/v/mU5W8MgtjeM&hl=cs_CZ&fs=1&"></param> <param name="allowFullScreen" value="true"></param> <param name="allowscriptaccess" value="always"></param> <embed src="http://www.youtube.com/v/mU5W8MgtjeM&hl=cs_CZ&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed> </object>