Hi Bill,
When I set up the map in the .th file, I created a map for "MainPassages" and another for "LowerStream".
You don't normally need to do this. You can just put the two scraps into the same map like this: map outermap mainpassagesscrap break lowerstreamscrap endmap This will display the lower stream's scrap below the main passages scrap. Or if you want to keep your two maps, then this should work: map outermap MainPassages break LowerStream endmap Make sure your .thconfig file has: select outermap@surveyname I think this is the most likely cause of your problem - if you don't select the right map, Therion will select all of the scraps, without any control over stacking order.
"[0 0] below"
This is something very different, and not related to stacking order. It is used to offset a map from its natural position, and leave a shadow "below" the other maps where it would normally have been. "0 0" would not offset it at all, so you are asking Therion to draw the map in its natural position, and leave a shadow ... also in its natural position ... below the map. Probably not what you were looking for :) Hope this is useful. Tarquin