Group Workspaces dashboards not updating

I am also having this issue. I have a dashboard and report that connects to a live SSAS tabular model. When I change a user from one security role to another in SSAS, the dashboard tiles still show them the data under the old security. However, if I expand the dashboard tile using in-focus mode, it shows the updated data. Also, if I click down into the report it will show the updated data. Since this is a security issue, I need the dashboard tiles to update instantly. I also have tried clearing the cache, waiting several hours, unsharing and resharing the dashboard, reposting the report to the group site. Nothing has worked.