Hi @pstevens and thanks for your reply.
I appreciate it a lot. 
So a group user is like a “team” in the system?
I remember SugarCRM CE had teams I think but it does not exist in SuiteCRM as far as I know about it. (?)
I know about the “Group Email” (I have set that up long time ago. But since it was only me in the company until now had yet to discover this issue), which is the one that is currently giving me the big headache.
Because it refuses to display on regular users - it only displays if the user has the “system administrator” role. Not sure how to get around this issue.
Thanks!