Switching between two audio output sources (speakers plugged in back panel and headphones plugged in front panel) causes a problem, that sound is still being played on speaker even if you have plugged in headphones. This specific issue occurs mostly on PC with two audio output jacks in front panel and back panel.

Repro steps:
1. make sure you have plugged in speakers in back audio output panel;
2. plug in your headphones in front audio output panel;
3. launch any Win Store Apps application with audio. Sound should play through headphones;
4. plug out headphones and plug them in again. Sound persists playing through speakers.

If we plug out both, speakers and headphones, and plug in back, sound will never return to neither.

Reproduced on Win8.1.

Also, this might be related to audio drivers, which recognizes and separates speakers from headphones, so Win Store App looses audio output source while changing audio channels.