When I open a video/audio track with my browser (Firefox or Chrome), the sound is very distorted. However this doesn’t happen when opening a media file or something that runs with Java, so I believe is a Flash problem.
I’ve tried uninstalling flash and re-installing Chrome and Firefox, but the problem persists. The flash version I’m currently using is 11,3,300,257. I’m using Windows XP.
SOLVED:
Apparently it’s a bug in the 11.3 version of flash. Following this post I uninstalled the 11.3 version and installed an old 10.3 one and everything worked.