I am having the exact same issue in civil 3d 2013. Was there ever a resolution for this?
Have you tried:
Close the drawing and reopen?
Recover the drawing?
Audit the drawing?
Close the program and start it again?
Shut down the machine and reboot?
Mark Green
Working on Civil 3D in Canada
I have tried all of the above. It seems to be a corrupted style, though I have not proven this yet. I can change the style to a default style, and it will display, even if I use the exact same layers and colors, etc. in the style. If the problem does not come back, I'll call it solved.
This thread has been going on for a very long time, so I figured I would continue it. I had these same issues and I am using C3D 2016. I used the "levelofdetailoff" command and it fixed it. Even though I never used the "levelofdetail" command to begin with.
Another solution for this issue could be that the file was orginally started from a CAD file and the display settings need to be adjusted.
Try "DISPLAYCONFIG"
then "DR" for drawing defaults
under medium detail select Model then
select the Display Representation Control
~check all boxes
Repeat these steps for Plan