Sound, ping, gong, when challenge gets accepted, please.

Come on, fix this huge "bug": I hear no sound when someone joins my "proposal" while I am watching analysis of previous games if I am not black! :D

Yes, sometimes the sound disappears for me too. It always comes back.

I think there is no sound for game start, only when oponent moves. Which is never if you are white and do not know the game started in other window.