Issue Description
Your Elevation/Section View is displayed on a fully gray background, it's missing Story Levels, and when placed on a Layout, appears totally blank. You might also be unable to select elements on the Elevation.
Solution
This issue is connected to the Viewpoint's Vertical Range, which can be edited in the Section or Elevation Settings.
Vertical Range is set to Limited, and both of its Elevation Values are set to 0, or the same value, which is causing an error.
1. Open Elevation/Section Settings dialogue.
2. Expand the General tab
A. Change Vertical Range from Limited to Infinite
OR
B. Change the elevation values of the Vertical Range; these values should be different from each other, and can be measured from different levels such as the Project Zero or a Story.