This is me, "stickjam" - just switched my SSO ID.
Anyway - one other thing I found is that the wet level fader only jumps to the current envelope level at start of playback when the plugin's UI window is open. With the UI closed, the wet level does nothing.
I might work around it by adding another surround bus as a sidechain effect and switching the envelope to fader level.
However the distortion is bothersome. Is 2.0.10.0 the latest version of Breverb 2? The project is a theatre production for video so it's quite large (26 tracks, 2 hours) at 24/48Khz. Still missing Pantheon Surround (the DLL from Sonar 8.5 is still in the shared DXi folder, but it's not recognized by X3-64bit)