Unable to set permissions for dashboards in MZNG 10.5

Good day,

While trying to set the Guest (Special group) for all dashboards in MashZone NG 10.5 as Administrator

, we find the settings dialog box irresponsive the this effort.

We could not find on Empower this issue reported, and will appreciate your advise if there are the relevant settings that could be helpful to allow this operation.

Thank you