I created a dashboard, and I saved it in my "UserDashboards" folder. I provided "Read only" access to this folder to the following public group "DashboardUserGroup". I have two users in this group: "Hannah Smith" and "Andy Barlow". Hannah can see the dashboard and Andy cannot see it.
I am completely lost as to why Andy cannot see the dashboard. They have exactly the same user profile, they are both members of that group.