Why isnt fist of guthix working on runescape for me?

on runescape (yes i play runescape) when i go to play the fist of guthix minigame it doesnt work. i go in to the waiting room, and when the game starts there is a countdown for it to begin and when it gets to one it goes back to the log-in page and says starting 3D library. and it stays there.forever.