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AutoCAD Based Build 3D Risers (Ribbon/Toolbar/Location)
Description:
While in your viewport, your riser is visible while in the 2D Wireframe view. However if you change the Visual Style to Conceptual or Shades of Grey/Shades of Gray, your 3D riser disappears. You may notice if re-appears if you zoom out.
Likely an error in the drawing's database.
Go back to ModelSpace then run the AUDIT command. Answer Y to fix errors and proceed.
Do a REGENALL then return to your Layout Tab and your viewport, then try REGENALL again.
Enter the viewport and try to zoom again.
-thanks Jake M!