First: That's a fine question (which I already investigated).

Second: Yes I'm sure because, as I said, the page renders correctly (on the Mac) showing that the css is in use.

Third: I tried it your way with a string constant as suggested just to be sure, and I got the same disappointing results.

 
FYI, I also set the AutoParseClasses to true before setting EditorWysiwygModeCss, just in case the order made a difference.  The AutoParseClasses was already set in the HTML tag.

Editor1.AutoParseClasses = "True"
Editor1.EditorWysiwygModeCss = "rjSite.css"

Thanks for your help.