I recently updated my lumia 521 to the devoloper preview of the 8.1, Cortana works AMAZING, and so far i haven't had any problems, except for one issue, the volume doesn't work!!!! When headphones are in use the volume works fine, but when the headphones are taken out the phone goes mute!!! The updated volume controls go all the way to thirty, but to no avail!!! no sounds from music, videos, and notifications, when i call i can't hear if it rings and i can't listen to the other people in the line. i am so desperate for help, please help!!!!!!!:unhappysweat::unhappysweat::unhappysweat::unhappysweat: