When I view my drawing in 3D, some of the cabinet sections are missing

If some sections disappear in a 3D view, it may be because the section is in a face that is not sealed.

1. Right click on one of the cabinets that displays the symptoms and select Format Cabinet.
2. Change to the Line&Fill page in the Sections category group.
3. Select the disappearing section from the drop-down list. Here you can make sure the section has the proper visibility flags set, and has Present Flag is checked in top RH corner.
4. If these are all correct and the section is still invisible, switch to the Section Size & Pos page.
5. Then look at the "Within Face" selection - if it is set to anything other than "Inside" or "Outside", then it is a section within a face.
6. Change to the container of the current section, by clicking the Up icon icon just above this drop-down.
   
      
   It only appears when the currently selected section is a child section (i.e. it has a container). For top level sections, it is greyed out.
7. Now change to the Face Texture page. If the Sealed checkbox for the appropriate face is cleared, click it and the section should appear in the 3D drawing.