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After working in Hammer for awhile, mostly with the Vertex tool, it seems that the brush gets completely messed up, or dissappears. While working, I see what I want to see, the brush gets moved around like I want it, then when I compile the map, or close, then reopen the map the brush is off in some scewed shape that is nowhere near what I made it in the first place. Is there anything I can do to stop this?