OK, I just returned from the one day RT.

I was able to check in on line for the first leg only-not the return. The return shows up but says "airport check in required."

The kiosk at the first leg would only show the first leg, and said I already checked in.

I stopped at the Customer Service desk when I arrived from my first leg and got the BP for the return flight.

The lesson learned here by me: Have a separate PNR for each and every leg I fly. Then I can check in online for as many legs as I want!

Thank you all for the insight. I used your tips and as you can see, it made my WN experience a good one. There is no way I could go back to the ignorance of the unwashed masses.