Am mucking about trying to setup staff forums with only Admins able to view one forum. Have ticked private node and individually given two Admins all permissions. However when I can to forum view neither Admin can see the forum.
And yes have tried inherit and allow on the member group.
What worked for me was setting all usergroup permissions to "inherit", which I think they are by default, selecting the private option, and going specifically to grant user in the upper right, and selecting "allow" for all components I wanted them to have. Otherwise, it didn't work as I anticipated.