Hi Acy
I didn't have to reinstall - what happened was we had an unsafe shutdown of the server and that, on reboot, caused us several issues of which this is one. Unfortunately (for me) it would seem backups of this server are non-existent, so I will need to try and recreate what we had.
What I am unclear about is that, with all message filtering ticked (so allowed) we are getting hundreds of messages from our routers, but not a single one is in the format we had before. If I just needed to unfilter the info messages I'd be OK!
Any more help you could offer would be gratefully received.