This looks very cool and I can't wait to play around with it. I'm shocked it has taken this long for 3d model sims to start coming to the educational market. I've been able to go to Rome on my Xbox for over 5 years now and just finally now on Google Earth. I'm very interested in following the progress of Edusim. It looks very promising.
..... Are you using the latest version Lisa - Alpha 11 by chance? .... If this is an older machine & an NVIDIA video drivers there is a potential problem if the "Threaded Optimization" setting is turned on. The solution is to adjust the driver settings & to turn this off under your video driver settings.