Something curious happened while I was in the middle of playing a game called Video Poker on my T600. All of the sudden, the sound in the game stopped. Then I tried some other games like PK Mahjong and Bejeweled and the sound in those games are gone too! I'm not sure what happened.
But the system sounds, such as the ringer, the beep sound when you tap the wrong place, and the wireless on/off sound still work.
Any ideas?