While I don't have an answer for you, I've also been watching some of the recent videos. I find this a very interesting alternative to car cards. I hope that someone finds the solution for your problem. I'll be watching for answers. Thanks for posting
Try your question on the JMRI Users group forum:
https://groups.io/login?group_id=12428&r=https%3A%2F%2Fgroups.io%2Fg%2Fjmriusers
Great resource for JRMI OPS including the guys that actually write the code.
Charlie - Northern Colorado
With the recent MRVP stuff on OperationsPro, I thought I'd give it another go as a less paperwork-intensive alternative to carcards.
I have ran into a strange behavior I haven't seen mentioned, so I assume it is caused by a mistake on my end, but I haven't been able to track it down. This is specific to routes that run a single type of car, such as ore hoppers.
The mine turn on my layout runs from the Mill-Mine Junction yard in the north (modeled as a yard for all intents and purposes) down through a few mining towns then back. It is meant to take empty ore cars that come out from the mills and are left at the junction, down to the mines to swap for loaded cars.
The behavior I am getting is that the train seems to not be able to "swap" cars at a location. If the mine has loaded cars there, the train won't bring empties to set out. I have plenty of moves on each stop on the route, which was my first suspicion. My second thought was that perhaps the software was trying to place the setouts before the pickups, and there wasn't enough space on the tracks to have both at once, so I doubled the length of the tracks. This also hasn't made a difference, besides the software sometimes trying to put way too many empties in one location (predictably enough).
Similar behavior happens with my ore mill trains and my foundry trains.
Does anyone have any thoughts on what this mystery may be? I'd like to be able to use JMRI for both the captive ore service as well as general freight, but it seems like it may only be feasible to use it with mixed freight.
EDIT:
The issue was that I was not using "aggressive" mode in train building, which is what is required for set outs and pickups to be done in the same stop (this is off by default as on layouts that have multiple trains serving one places it can lead to issues if stuff gets out of sequence).