Indicators

A radio, or a path profile's receiver, can carry a ring drawn around its marker to say what state it's in. Two can be present at once: one for what the object is doing, and one for whether it's selected or under the pointer.

Ring	Looks like	Motion	Meaning
Selected		Still	The object is selected, or its network is.
Hovered		Still	The pointer is over the object, or over its network in the tree.
Needs calculation		Still	Settings or position have changed since the last calculation, so any coverage shown is out of date. See auto calculations.
Queued		Spinning	A calculation is waiting its turn behind another.
Calculating		Spinning	The calculation is running now.
Drop target		Spinning	A template is being dragged over this radio and will overwrite its settings if dropped.

The dark grey rings say nothing is happening yet: still for work you haven't asked for, spinning once it's queued. White means the request is in flight.