Can you be more specific?
What revision of ChemStation are you using (Help>About)?
Where in the software are you clicking on 'Single Runs'? In the navigation pane folder tree in Data Analysis? If that is the case, my first guess would be that maybe you are hiding the navigation table. Try clicking on the Show/Hide Navigation Table button outlined below:
Thank you so much for replying so quickly.
It was exactly what you said.
Once i clicked on "Show table bottom" I had the single runs displayed back to the calibration table.
Thanks a lot.