I have exactly the same problem but I do have ASP.Net Ajax integrated. I followed the instructions here: http://sharepoint.microsoft.com/blogs/mike/Lists/Posts/Post.aspx?ID=3
I added the script manager to the master page and replaced the rich edit control on the page layout.
I have no tool bar, cannot click on the control and the status bar says 'Please wait while scripts are loaded...'
I checked through my web.config and made sure the dlls are the correct version etc. but still no joy.
Anything I can try to get more info?