I have a E7-00 with Bell Refresh with a simmilar problem.
Bluetooth works with different headsets when calling. Though, sometimes I have restart the phone to make it work
However, I can not hear any sound of media played on the phone in my BT headsets, and for one of my BT headset media files wont't even play.
I swithched from N7 to E7 becuase with time the Bluetooth on N7 stopped working due to a low memory and a HW problem. I am afraid that my E7 with is less than year now may also have a HW problem, as it worked well in the forst half year, or it may be due to the Belle Refresh.
Maybe try renaming your phone to something with only letter characters.
I found this helped with my car stereo