Currently not having success adding a map to Op. Dash - essentially nothing happens. I go to add the map through the Map widget (adding a Portal map), and Operations Dashboard just hangs. The little blue bar towards the increments a bit, but eventually stops well under half way and then eventually freezes.
Recently upgraded to Portal 10.4. I have tried this on maps with and without ArcGIS Server security, and neither one works.
Trying an uninstall/reinstall of Operations Dashboard but otherwise am out of ideas.