Thanks mhertz,
Good guess!!! Deleting the file you mentioned has sorted the problem
Probably should have mentioned in the original post i am running deluged: 1.3.15 and is running as well as it ever did, even with the -d switch!
Again, thanks for your help!
Anthony

Hi, I have been using deluge for a number of years most recently on a pi4 running rasbian buster. It installed fine and had been running well for about 4 months, but came to it tonight to find it wouldn't start. I had installed following the intructions here https://deluge.readthedocs.io/en/latest/h...