EspruinoHub IDE not offering BLE devices

Hi folks

I've replaced my office Pi 2 with a Pi 3B+, partly so that I can use it and EspruinoHub to deal with my Puck and Pixl devices. I had it working with a Pi Zero W some time back, but that board has been used in a project since then. My problem is this - the backend can see BLE devices, and continues to see the devices (I've got it running in a terminal at the moment) but the WebIDE installed alongside won't acknowledge them and I can't connect to anything. So far I've...

1. rattled through all the repos, running npm install at every level, hoping that something will spark it up
   
2. run ./start.sh as both standard and root user
   
3. installed the system service
   
4. deleted everything and tried again
   
   

Still no luck. Any advice?

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