AutoCAD Civil 3D

[#1]

does promoting the surface into the current drawing allow you to label the contours?

can you post a copy of the drawing in question with just the offending surface in it?

[#2]

Waht version are you using? Do you have all the appropriate updates installed?

http://usa.autodesk.com/adsk/servlet/ps/dl/index?siteID=123112&id=2334435&linkID=9240698

[#3]

Thanks everyone. I got it to work. I think the drawing was corrupt. I opened a new drawing and copied everything over, and now it works.