Sound and video are choppy since installing Flash Player 11.3

I'm having a problem here!  Since I updated Adobe Flash Player 11.3, the audio and video are all choppy when I play Adobe Flash game apps in Facebook!  Even when I disabled hardware acceleration, the sound and video are STILL choppy!  Even I watch a YouTube video and the sound and video are a bit choppy!  There's DEFINITELY some sound issues in Flash Player 11.3!  I'm using Firefox 13 in Windows XP SP3.  I'm wondering if you have any answers for the sound issues in FP 11.3.