Glitched gearing when limit is set beyond 500 kmh

As title says, whenever I set the top speed of the car to anything above 500kmh on the gearing the game enters a never ending loading, when that happens the graphics disappear and the only way to get it back to normal is setting the top speed below 500kmh. This is the first time this happens to me and I have no idea what to do. Help? (Sorry for bad english in advance).

Yes, that is a known issue, the tire cost calculations break at the 500 km/h mark, which causes the hang up. It will be fixed with the next patch.

Oh, alright, thanks for the help!