App loader not working

Do you have something like adBlock/etc running on your web browser?

No. I've tried disabling all my Chrome plugins and restarting Chrome - no difference.

Also, it might be worth going to http://espruino.com/ide and seeing if you can communicate with the watch in any way.

That just sits there saying 'Connecting'

... also, try: https://www.espruino.com/Bangle.js#reset­ting-without-loading-any-code

I've tried that - the same happens.

Could it be the Bluetooth in my laptop (a brand new MSI Prestige 14)? It seems to work OK for other things.