If a non-admin member of the CO joins a group bound to a Dashboard they then see the Dashboard. If the user leaves the group they view of the Dashboard remains. Note that this is Not the case with Service widgets which seem to work fine.

related images of the system and user (Clinty) can be found at
https://internet2.box.com/s/xvw5nzqzhef1vx7i9kzznjdnr3nuy4gs