Hi Steve,
Since you are already looking at fixing one bug, how about another? This one is cosmetic, though possibly confusing.
The Set Railcar Fill button brings up a dialog with an edit box labeled Maximum number of cars to add per track. This Maximum number of cars value defaults to 22. If you change it, click Ok to save and exit that dialog, then go right back into the Set Railcar Fill dialog, the value is reset to 22.
I believe it is a field initialization problem with the dialog, because if you change the value, then generate an activity, the new value you entered is the one that is used.
Can you confirm this?
Thanks,
Tim