I am in the middle of drawing in walls on our maps for an 8-city deployment with about 130 AP 230s. I'm on the first floor of one of the buildings and am about 80% complete with the walls but now I keep getting "Error: The request was unsuccessful. The session might have expired. Refresh the page and try again." every time I attempt to add another wall. I can update existing walls OK and add walls to any other floor in the same building or in another building in a different city. I've tried the obvious troubleshooting (different network connections from different PCs, different browsers, rebooting the HiveManager VM) to no avail. This makes me wonder if there is a limit to the number of walls that can be drawn on a floor. I'm being rather detailed on the map because it is an historic building with many different types of walls. Any suggestions are appreciated. Thanks.