i had the same problem as many people. Editor does not seem to work for me. But my advice to any who wants to change the game is to download the real time editor and use that. Very easy to use and works instantly.
Wasnt aware there was another editor. However, if you use the data editor that comes with FM10 to look through sports interactive > football manager 2010 there is a config.xml file in there, and if you go on through to do editor data folder, there is another, so delete both using the data editor.
(thats how i managed to finally get my barca one to work)