I believe that there's a bug, but maybe this is by design...
I'm using version 6.0.15567 with MacOS Sierra 10.12.13.
If there is a Room Tone channel in a VEP instance, upon saving, the volume level setting of the room tone isn't saved. If the project is closed and reopened, the room tone setting is reset to 0 db, and has to be adjusted every time a project is opened.
I believe that this was not the case until sometime fairly recently.
Thanks,
Michael