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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Honestly, I doubt it. The Espruinos work on every other Mac, Windows, Linux, Android, iOS, Chromebook device, and they worked on your Mac before you updated. So the one thing that's changed here is the Mac OS version and I think that's probably the best place to start.
Have you tried just restarting your Mac? Sounds stupid but sometimes the Bluetooth adaptor can get confused.
Can you tell me what exactly happens when you try to connect? Do you get any error messages? What if you look at the Chrome dev console after trying to connect?
Also, if you go to https://www.espruino.com/ide, click the 'connect' icon up the top left, then the 'status' link, does it say anything other than 'Ok' next to 'Web Bluetooth'?