Just a note to the devs...
I ran into the Initializing Stream error today, while testing various bluetooth headsets.
I had configured a command to beep the headset when stuff worked or didn't work and routed the beeps to the headset via the Channel dropdown on the "Play a Sound" dialog. Having finished testing with the first headset, I completely removed it from the machine, rebooted, and connected the next candidate. The next time VA launched; the stream error came up.
Finally discovered that when the first headset was removed, the Channel dropdown control on the "Play a Sound" dialog for the aforementioned command was disabled and locked and could not be changed to the new headset. I "duplicated" the command (right-click in the commands list) and the dropdown presented in an unlocked state, so I could change to the new headset. With the Channel configuration fixed, the stream init error went away.