Default [Q] Sultan's CM11: t-mobile visual voicemail causing audio fail

When using Sultan's CM11 (full-wipe install), the t-mobile visual voicemail app will crash some audio functions. If I try to play a voicemail, it will crackle for a second and then nothing. After that, I can't hear phone audio until a reboot (although games work fine).

any clues? Everything else seems to work, but this is one app I need. The youmail voicemail app didn't work for me either.