Thx huskyman for your help, but unfortunately it didn't help. The track is still flashing white and this is killing me because the track is amazing and I would love to drive there without this annoying thing.
I installed the track on 2 other PC's running GP4, and the result is the same.
Any other of you Guys facing the same problem? I can not imagine that I'm the only one.
I uploaded a video, so you can see for your self what I mean.
MediafireAlso there are no cars shown on the grid page (see picture).