Hi Simon – I am having a little difficulty understanding the issue. If you create a new CBOX site – all the activity, members, and groups should be empty. Could you provide a link or screenshot of the group that doesn’t appear in the group tab? Did you create the group on the front end or the back end of the site? As an group admin, you should check your group settings to ensure you have activated all group features you want.
If you intend to create a multisite CBOX site – you shouldn’t install CBOX on each domain. Is that what you are trying to do? Not sure…