Is there a workaround for the Chateau grenade glitch?

I can't move forwards in the Chateau as it freezes when I get to the grenade tutorial. No matter how long or short I hold L2 for it will not throw a grenade. All other function via the start button are fine i.e. option, bonus etc. but it won't throw a bleep grenade. Can somebody please tell me how to proceed.

I had the same problem and I fixed it by restarting my singleplayer game and now it works fine for me but there is just a little lag when I tro granades.

1. if you have tryed that then it you will need to return the game and get a new one.
2. it just might be your ps3 problem.
3. or you can try changing the controls so you throw your grenade and you can change it back later with a different button for example "changing the L2 to R2