Since I flashed my phone I am having Sound/Video Problems, what could be the cause?

[Dchl]

Sound/Video Problem

I recently flashed CM11 on my Rooted GS4. Since then, I have had NO SOUND. Along with this, no videos will play. I can't play YouTube videos, view video SnapChats, Instagram Videos, or anything. The only way I can watch a video is through the Mobile Mozilla Firefox browser (that's the only browser that works).

Does anyone know a fix for this?