Version 2.6b is now online.

The controlls have improved a lot. More sounds, one car with turning wheels.
For registred users there is the possibility to build and save and load tracks.
Screnarios are:
Bavaria ; Florida ; Spain ; Kairo ; Hong Kong and soon Russia.

@ Cool_amigaN

I have not heard of any one that had the same problem. But i have to admit that
I only have G4 machines here.
Try to re-install from scratch, you have the possibility to contact the developer on his
facebook side:
https://www.facebook.com/groups/437267409800246/?fref=nf
good luck!