This could well be nothing to do with NR but I have to start somewhere.
As some of you know, I run Node-Red 24-7 on an RPi4 32 bit - EVERYTHING up to date....
Except as I just found out - if I wanted to re-install Grafana from scratch - they no longer support 32 bit ARM for InfluxDB - SO - with my fully working Grafana + MQTT + Node-Red setup, I (made a clone first and) did the rpi-update and the change to /boot/config.txt to say to use the 64-bit Raspbian... and rebooted.
Lovely, my existing Grafana works - and Node-Red started up - "Welcome to Node-Red" - flows started - "Zigbee2mqtt-server - refreshing device".... "email sent" - all looking good and then... "Bus Error" in the Node-Red console... NR stopped - end of story.
Any ideas as to how to progress this? I've no idea how to progress "bus error" in the NR console.