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I have my osnap settings set to include perpendiculars, however, when I try to draw a perpendicular line it ends up being 79 degrees. I know there isn't an endpoint so I'm not really sure what the problem is. This is working on all other drawings.
check to see if there are different elevations from one end of a line to the other. a 3d perp can cause a 2d dim command to mess up.