Have you ever noticed after editing your corridor in the Section Editor, then closing the Editor that everything in Model Space doesn't look quite right? Civil Objects seem to be missing, and the drawing appears empty? This may occur after an improper shutdown of the Corridor Section Editor. For example a sudden close or crash when working in the Editor.
What appears to happen is the Plan view in model space needs to be reset. Simply type in the command PLAN, then hit ENTER, ENTER. This should bring Model Space back to its original state and all your objects should be present and accounted for.