Time to report the bug to them and ask if you can roll back to the working 6.0
Here I found so little different from 6.0 to 6.1 that we didn't bother.
Hi, I own Asus P535.
After upgrading from WM6.0 to WM6.1 I have not been able to use my BT stereo headsets.
If I'll connect headphones like "High definition audio" and then i wannt play music from audio manager or WMP will start but then it will become choppy as if the connection is going on and off every second.
Didn't have this issue with WM 6.0. I also noticed the elapsed time of the song in progress is also erratic.
When the BT stereo headsets are connected like "Handsfree" then they become disconnected if 2-10 second.
and next what i noticed.
Bt manager have something what control range of BT... (signal strength) this function doesn't work.. still show just proper even if i walk away..
and sometimes its possible to find the point when the music is playing normaly.. but every move with mobile or headphones interrupted playing.
(BT-PPC/PE 1.7.1 build 9807)
PS: with any other deviece this BT stereo headphones work correctly.