Hi, recently I was developing a OpenAL Manager class. Its working fine except for one problem I am facing. Whenever I try to play mono ogg files, it sometimes work, sometimes don't work. :( This is frustrating. All I know is that this only happen to mono ogg files. If I put a breakpoint before it play, it will always work. But then if didn't put a breakpoint, it randomly work and don't work. Most of the time it don't work. I tried putting a while loop to generate a short pause at the place I put the breakpoint but still the random playing still exist. I actually tried recreating a new source whenever I tried to play a sound. This method of doing have no effect on stereo type ogg but cause random playing in mono type ogg. I am using OpenAL 1.1, Ogg 1.1.3 and Vorbis 1.1.2. Can anyone help me? If you need code, I have no problem in posting it ;)