Movement trails only showing for selected unit -- how can I make them stay?

I have been trying to tweak the Blue and Gray module for Cemetery Hill (Module:Blue & Gray: Four American Civil War Battles - Vassal) to have movement trails that persist.

I have set the movement trails attribute as follows:

(that’s for usaUnit, but the same is for csaUnit)

I see movement trails now, but only for the currently selected unit. When I select another unit the first unit’s movement trail disappears. When I select it again, it’s trail reappears.

I would prefer the movement trails persist until dismissed. How would I do this? I thought that setting the “Unselected unit trail transparency” to 100 would make that happen, but apparently it does not.

Yes it should (it does in my test module).

Are you using an existing save game or Predefined Scenario? You would need to refresh the current game or pull new counters to see the change.