I am using RD 2010 on Civil 3D on a new Dell with Windows XP 64 bit. With this version, whenever I do anything, rub out a section, draw a line that intersects the image, the image distorts on the screen. If I Regen, it looks ok again. I need to Regen all the time to be able to work and it is really slowing me down. Does anyone have any idea on what's going on and how I can fix it?