I have the same problem. I cannot edit my script anymore in the Airtable client.
It used to work for several months, but now it doesn’t seem to work anymore, without changing my config or adding extensions. When I try to edit script, I get the spinning wheel, spinning for hours without any result.
But … I can perfectly edit my code in the browser !! There it seems to work normally, but I prefer working on the client of course…
PS I’m working on Mac OS X and safari.