Observer UI doesn't automatically update


I’m running macOS Big Sur v11.2.1. When I run observer (by calling :observer.start() from IEx) observer launches fine, but I find its UI doesn’t automatically refresh itself, particularly in the Applications tab. I can force a refresh by switching to a different tab and switching back.

Is this expected? I believe the behaviour is new since I upgraded to Big Sur. Anyone know of any workarounds?


Once again, as soon as I post on Elixir forum I immediately find the answer: Application process tree doesn't get updated in :observer · Issue #9997 · elixir-lang/elixir · GitHub

In particular this did the trick:

Version 3.1.3 caused a segfault when I attempted :observer.start(). No dice. So I tried v3.1.4 and that worked perfectly.