Dear Andrew,
It seems, that you are a late victim. But you are not alone. We all have received an automatic update. Since the update I have to reboot my NUC-Roon every 45 minutes because the system tells me, “There was an issue loading your database”. Unfortunately, importing one of the previous backups so that the loss of data is limited does not help. Problem is, that your database has been inconsistent for a longer time. and beginning build 880 Roon checks, if a database is corrupted. If so, you can’t use it further.
I already started a deeper discussion here:
Some Words regarding Support & Service in connection with Build 880/882/884
Maybe you want to join.