Could it be that all of you might need an update in the dvd reader in your cars.

Think of how old your car is compared to when the dual layer dvds came on the market, I think it was around end 2004 or beginning 2005 the dual layer dvd's were beginning to sell.

My isolated problem anyway is that my volvo V70 from 2003 isn't able to read any genuine navigation dvds from 2005 and forward, probably because of a malicious reader software.

Hope that volvo can solve my problem.

Best regards
Nicolai
Denmark