Basically, if a node is unreachable for whatever reason the dashboard won't fully refresh. I have a node that isn't on all of the time and when it's off nothing above “Guests With the Highest CPU Usage” refreshes....the panels just spin.
This just happened to me. Eventually the dashboard finished loading (I have 23 nodes and 2 offline, it took about 3 minutes to load the dashboard). Expect to see bugs so just dropping mine off. It would be nice to know which remotes are not reachable and under "Virtual Environment Nodes" when some are offline, i get an "unknown number of nodes online" message