Adam,
I've changed the path to:
EditorWysiwygModeCss="~/App_Themes/ryedb/ryedb.css"
and it's just the same. This doesn't make any change. In fact the link with http://... is also good because you see the background from the css file in the cute editor box and if you click in the box the font is good, so it should be something else.
Can't we use a SkinID in asp.net ?
Regards,
Bart