I have two drivers with the same name and if you change them after saving they revert to old drivers.
The other problem is if you change a loco the session route instructions are lost when you run driver with message "driver under manual control". If you remove loco and session rules and redo them the situation remains the same.
The other problem is if you change a loco the session route instructions are lost when you run driver with message "driver under manual control". If you remove loco and session rules and redo them the situation remains the same.