Spike Activity not showing on Spike Graph

Hi, I started following the Nengo Summer School videos on Youtube.

I do pull up the spike graph for ensemble A, but when running the simulation, there is no spikes visible on the graph.

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Yes I am also facing this issue.

I’m getting this error in the terminal as the simulation is running:
Edit: this seems to be unrelated to the spiking activity not showing problem.
Edit2: this comes from closing the browser while Nengo is still running from the terminal.

ERROR:nengo_gui.guibackend:Error during websocket communication.
Traceback (most recent call last):
File “c:\python37\lib\site-packages\nengo_gui\guibackend.py”, line 269, in ws_default
msg = self.ws.read_frame()
File “c:\python37\lib\site-packages\nengo_gui\server.py”, line 543, in read_frame
File “c:\python37\lib\site-packages\nengo_gui\server.py”, line 524, in _read
self._buf = self._buf + bytearray(self.socket.recv(512))
ConnectionAbortedError: [WinError 10053] An established connection was aborted by the software in your host machine
r, _, _ = select.select(sockets, [], [], poll_interval)

Nengo version 3.1.0 just came out Nov. 17, 2020.
I reverted to version 3.0.0 by doing the commands below, and now the spiking activity is now showing. Now, how do we bring this issue up?

pip uninstall nengo
pip install nengo==3.0.0