I have been following the tutorials at http://www.planetunreal.com/architec...rst_level.html and I have gotten up to the part called "Terrain Part II", I am at the end of it trying to get a pathway between the two rooms made, but I am running into a big problem, whenever I try to subtract a box to make the passageway, my entire terrain will dissapear. Hitting undo wont bring it back either. I have tried subtracting in areas nowhere near the terrain but the same thing happens. I'm stuck and have tried everything I could think of. If anyone can help me out, please do. Thank you.
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