Trouble posting a video, WYSISYG editor won’t go away

I just installed WP for a friend, after spending months trying to get her to switch from MT. The first thing she tried to do was post a video, and it won’t work, it throws the layout off in a custom theme, and just doesn’t show up in the default and classic themes. I tried to post the same video (it’s from YouTube) in my blog, using basically the same theme, and had no trouble at all. I uploaded MY theme to her site, and posted the video…didn’t work. I’m still using WP 2.0, I installed 2.03 for her. The one big difference I’ve noticed is that the posting area looks different…it seems like the rich editor won’t shut off in the new version. Has anyone else run into this issue, and does anyone know a solution? Can I still download WP 2.0 anywhere? As much as I hate the idea of reinstalling (and re-importing all of her MT entries), I’m willing to do so if it’ll fix this issue.