A couple of days ago I upgraded wordpress to 2.2, and the upload portion in my "write post" screen has disappeared. In it's place is a partial screenshot of my blog's static homepage with a 404 error message on it. I've tried different themes in case that was the problem, but it happens with the default ones, as well as the other's I've installed. I don't know what's happened, and upgrading to 2.2.1 hasn't helped. Does anyone know how to fix this? Any help appreciated.