Does the loading screen at the start of the game get stuck?
Sounds very strange. Does the game work on other sites then?
It works fine on Itch.io and if I'm not logged in at crazygames but when logged in (both safari and chrome) it gives this error. When playing in this 'offline' mode it still access the leaderboard but won't save and will fail to import valid tracks. I'm currently using Itch.io and all the tracks that the 'offline mode' said were invalid are also fine.