This is strange when I use Passur to track aircraft. When I use a Mac OSX at the Apple Store, I don't get any aircraft shown on the map. I must load Firefox and then it works great. However, when I use Passur to track aircraft using Windows Vista on a different PC, I can only get the aircraft at Normal Speed. When I try to go to 2X, 5X or 10X, the aircraft "freeze". What could this be? It is very time consuming having to view aircraft at normal speed.