Refreshing Instrument and Light Position Data
The Modify > Refresh Instruments command updates light position information and instrument labels to reflect any changes that have been made. This ensures that all current data is displayed; it is a good idea to select this command before printing the light plot.
Two-fers do not get updated with the instrument information when the Refresh Instruments command is selected.

Creating and Editing Instruments : Editing Instruments and Objects : Refreshing Instrument and Light Position Data

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