Stuck on Loading Screen

[Rusty Nail zh]

I started this game 2days ago. Finished the 1st cup and didn't have any troubles. 1 day later I wanted to tackle the 2nd cup and I always get stuck on the loading screen before the race. I also tried a race from the 1st cup. Same thing. And then I tried a time trial. Also stuck. Uninstalled and redownlaoded the game, but the problem is the same. Can't start the first race.
Anyone else had this problem? Any solution? Thanks!