Reverse loop flashing on iTrain track plan when a loco runs on another section of track?

[WIMorrison]

I can't find the posts (actually I didn't look very hard) but I am certain that swapping the DR5013s around was suggested in one of your other threads on this subject. Is this the first time you have actually swapped them around to see if the fault moved with the unit or whether it persisted?

 

When you have spare, or multiple units, then 101 for fault finding is to move units around and see what happens to the fault - well worth remembering.