I use mumble with 2 different Bluetooth headsets (one in use while the other charges). This is via PulseAudio in Linux. If I use mumble with "headset A", and then close it, then subsequently disconnect "headset A", connect "headset B", start Mumble, run the Audio Wizard and select "headset b", it freezes upon clicking next.
I can not get it to switch to "headset b" unless I close mumble, and delete the [pulseaudio] section from ~/.config/Mumble/Mumble.conf, which corrects the issue until I do the sequence again.
Gentoo, 188.8.131.52 (kernel.org stock kernel)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
Bus 006 Device 002: ID 0a5c:2101 Broadcom Corp. A-Link BlueUsbA2 Bluetooth
Headset A is PLT 510
Headset B is backbeat 901