[ASK][Win7] No sound on headset

[Bee-Ant]

So, my GE suddenly won't transfer the sound to the headset.
I check the Sound Mixer, I set it correctly.
I check the other app, I can hear the sound.
Strangely, exported game works just fine.
It just happens on GE app. It won't play (well, it probably does play it... just won't transfer the sound) music when using PlayMusic, it won't play sound when using PlaySound. It also won't play music nor sound on Game mode.
Any idea why?

[Hblade]

Thats odd O.o