For some reason one of my PS2 diesels was very slow to respond today, even after powering down the layout and repowering everything back up again.
I then decided to delete the offending engine and readd it again.
It was originally in address 7, but re added to address 19.
Address 7 still exists but remains blank and I can't access it.
Both the remote and the TIU are upgraded to 5.0.