You're not the first to see this, sadly. It has been reported to our ui development team and they are actively investigating it. Hopefully it will be resolved soon. If you're still seeing the issue tomorrow consider opening a support case for more traditional updates.
It seems that you can still make some changes by going via the Switch -> Switch Ports area.
Can't tell if the changes are working because I'm having issues with a device and can't see if there's any "Client" activity.
So close, yet so far, n184 still having issues with in particular photos on the location tab, you can access it but you have to refresh the page after it initially fails to load each time.