I created a surface and added contour labels. Everything looks the way I want it to in Civil 3d. I then xrefed the surface into another drawing that my coworker can work on in regular AutoCAD. However, in the new drawing, the text mask behind the contour labels displays as a transparent rectangle, so there's a box around the text and the contour lines can be seen behind it. Any way to fix this? I can't figure it out.