Ok, so this has plagued me for almost half my life now XD The mordino casino 2nd floor has see through and shoot through walls sections even though all the walls are correctly set. The problem is the north wall of the main mordino room - it's see through and shoot through in places, and this is a problem because of how mordino is scripted (and in general). It's possible that the whole room is problematic. I've tested it, and it seems I could only shoot through the northern bookshelf. Andother strange quirk is that aiming down the nothern hallway registers that line of sight is blocked by something at the very edge of the corner, and it causes really strange aiming situations. Right next to that wall are 5 things - a chair, 2 large bookshelves, a bed, and a lamp. I think the mapper automaticaly places invisible blockers related to the objects, and since some are shoot through and some are not, an overlap could be interfearing with the walls. I also see a red hex indicating an invisible blocker in the corner hex where I'm not able to aim properly. If I remove the walls for testing purposes, some of these blockers remain. I checked the shelves, chair and items, and it's all shoot through. Theree things could be causing it (and simmilar situations elsewhere): 1) The scenery related blockers are interfearing with the wall related blockers and are making them shoot and see through. 2) Whoever made the map had placed the wrong blockers - they look identical. 3) Something about large tiles - I'm not sure they work properly for me (I am sure they crash my game at EPA, so I can't test it) So my question is - how do i edit blockers in Mapper? I can see them if I uncheck the "hexes" box, and I can place them, but I can' seem to select or edit them. And an unrelated mapper question - how do I place and delete roof?