And as far as unmarking, the marked property is listed on the Advanced tab in properties. The unmarked tracks have no value in that field. I am unable to clear the field manually, though. I can set it to other things, but that's not apparently the right thing to do. If I clear it out and click okay, it just reverts to whatever was in there. So I can't even really get to the point of testing it accurately, since the UI doesn't work right.