Suisse 2004 scenery

I recently installed the freeware Suisse 2004 package. However, I am finding that when I attempt to start a flight from some of the airports included e.g. Geneva, Lausanne, La Cote, Schanis etc it results in a CTD followed by tell Microsoft about this problem whereas other airports included in the package seem to be OK. Has anyone else experienced this problem or have any idea what is causing it.RegardsTrevorbee