Ok, I have fixed this.
Had a look at line 1344 of process_processlist.php, found it referred to ‘publish_to_mqtt’ from Emoncms. Went to the Inputs page and removed all Publish to MQTT process actions (I don’t need them any more having spent all this time updating EmonHub). Immediately it comes good.
Not sure if Publish to MQTT from Emoncms is broken, or whether the config has changed somewhere (settings.php looks the same to me). Not going to dig further this evening.
That just leaves the ‘ReferenceError: _Tr_Vis is not defined’ error on Dashboards, and the fact I cannot edit Dashboards and widgets don’t display. Getting there…
Cheers,
Andy