I have implemented RTE in a few ASP.NET Web sites with success. Each time I put RTE in a .aspx page. But when installed to an ASP.NET User Control (.ascx), RTE dialogs fail to load properly as you can see in this screen shot. A vague error message appears. Note, I took the exact same configuration that failed in the ascx user control and put it in a .aspx page and everything worked fine. Is there is some problem with RTE that prevents its dialogs from loading properly from a .ascx user control? Or is there some special configuration that is required? Thanks.