Block Category List is Missing from Block Selection Dialog Box (Placing Plan Graphics, Elevation Graphics, or Amenity Reference Notes)
Issue
You're attempting to place a block, but the block category list in the left pane of the dialog box is missing several of your custom block folders.
You may be experiencing this issue with:

Cause
You may have activated a view filter using the options at the top of the dialog box, which toggle between views of the blocks' thumbnail previews.
In this example, the view is set to Back, which hides block categories that do not contain blocks that have a back view available.
Solution
Toggle to another view, such as Front. The folders should Reappear as a result.
Still not seeing the block categories in the list? Send us a technical support ticket detailing your issue.
