CUNY Academic Commons

I'm trying to add a new user to this blog . When I start typing in the user's name, the drop-down list of members shows up and I select the members name. But it appears that the selection is not being registered and I continue to see a spinning disc showing the that the system is still working. I then try to submit the choice, but it doesn't take effect -- the member did not receive a confirmation message. And when I try to submit while skipping confirmation, the user doesn't show up in the list of members.

Screenshots attached.