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CAUSE: When an Ortho view is generated it is only looking to create the two-dimensional views from piping, valves, equipment and structural steel in the Plant 3D model. This information cal be found in the Plant 3D help, About Orthographic Views. Even though text is visible in the OrthoCube, it will not be included when the Ortho is generated.
SOLUTION: If you wish to have text in your generated Ortho views, then text will need to be placed after the Ortho view is generated.