not really a bug on volume locker, but here is a quite embarrassing situation happened to me:
i had the volume locker set to "disable volume lock while screen's locked" and listened to music on my headphone. when i got to work, i paused the music and much later unplugged the headphone and went to a meeting; somehow the music player bug thought i plugged the headphone in and the music resumed playing. my profile set the media volume to 0 so i couldnt hear it. during middle of the meeting, i pulled my phone out to check the time, my finger got caught on the "volume up" button... needless to say, i was blasting music during the meeting and had to scramble to lower the volume...
this is really google's end of the problem, but just an fyi that it could happen to you; now im changing back to my old way to activating profile: around the time of profile change, manually disable volume locker, then re-enable it when profile is changed, and disable the "disable volume lock while screen's locked"