Angry Bird Apps?

Have downloaded the free version of angry birds hd and rio. After playing hard I've lost the sound effects of the game, sounds pretty strange. Even tried to remove the game and install it again but in vain. Any clues.....

Solution time! If anyone has encountered such problems, an easy way out is to switch off and put it on again.

Thanks for following up on that, it will be helpful to someone in the future I'm sure.