I'm having the same problem. No elevations are showing when hovering over the surface. Also using the ID command returns an elevation zero. Tootips are on as is dynamic input. I have tried rebuilding the surface but this doesn't help.
Did anyone have a solution to this?
See the post that helped solve the problem for me here
Most likely your tooltips were turned off in that drawing.
To turn them back on you can go into the Drawing Settings and turn that option ON.
To get there click on the C3D button on the top left of screen> Drawing Utilities> Drawing Settings. Then go to Ambient Settings> General> Show Tooltips> Change value to 'Yes'
You can also type in TOOLTIPS at the command line and toggle it on.
TOOLTIPS at the command line is an AutoCAD generic setting
What s_smulan is referrring to is Civil 3D specific.
If TOOLTIPS = 0, then it doesn't matter what the C3D settings are set to, but if TOOLTIPS = 1 and the C3D setting is set to not show tooltips, then they will not show up. Also, the C3D setting can be set at the top for a drawing-wide setting or it can have a different setting per feature (For example, you can turn on Surface tooltips, and turn off Alignment and Profile tooltips)
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