Have you already driven 12 laps in a race against AI. Crossed first the line and ended up with the popup window showing 0 CR and your car level hasn’t increased? I really had that today - I had that. What I’ve often had is that the car level was added with a delay, i.e. during the race. Now I had the problem few laps before ending that the car level progress did not work. Not even with a delay. And when I crossed the finish line after lap 12, I earned exactly 0 CR. The popup showed 0 CR!. I was not amused at all.
Restarted X-Box, started a new free game race against the AI. No car level update. Left the race. Played a 2 lap game. No car level update. Crossed the finish line to have the opportunity to see if reproducible. Black screen with music for several minutes. Restarted X-Box.
Internet-Connection: OK
Everything in order
There are no problems with your multiplayer connection.
I own the car, no rental!