• Thanks... It turns out that just having the 'Inspect Element' window in Chrome open is enough to make it work!

    So either:

    or:

    • Follow the instructions here to install the GitHub version of the Web IDE
    • Open the Web app, and if it's not working then right-click on the title bar and click 'Inspect Element' (a window should open)
    • Now right-click on the Web app again, and click Reload App
    • It should now work

    I'm going to try and get this working properly, but it looks to me like pretty big problem in Chrome if it only happens in MacOS and only when one of Chrome's windows isn't open.

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