since wednesday i can only play championnats. when i choose time trial, it load 3 seconds then back to menu.
What time trial? A regular leaderboard? If yes, does the issue appear on all combos that you tried or you only tried one specific combo? But anyway, check Raceroom file integrity on Steam and rename Documents/My Games/Simbin folder. Any name will do, the game will create a new folder with all default settings. If the issue is fixed, then you can bring back your car setups, control profiles, replays, etc. from the old folder.