Normal

A normal, up-to-date viewport displays with orange highlighting when selected

Out of date

When the objects in a viewport have changed since the viewport was created or last updated, the viewport becomes out of date. An out-of-date viewport is indicated by red text on the Update button on the viewport’s Object Info palette. Optionally, an out-of-date viewport also displays with a red and white striped border around the viewport (see Document Preferences: Display Tab).

Empty

A viewport displays as a red “X” when the associated design layer contains no objects or the objects are hidden, or when the associated design layer is set to “invisible”

Unlinked (section line)

(Design Series required)

An unlinked section line (disconnected from its associated section viewport, possibly because the section line was pasted from a copy, duplicated, or mirrored) displays as a black and yellow line, and “Not Linked” is displayed in the Object Info palette