I haven't encountered this problem but I have been having issues for a couple weeks now when trying to put together multi city trips. When I try to do it via price by schedule whenever I get to the third leg of the itinerary I keep getting the "sorry" error. I reported it to NWA but still haven't heard back from them. It is a bit unnerving when I want to chose specific flights for some mileage runs/mini vacations and I keep getting erred out. I am not sure if it is just my searching or if there is a deeper bug in the programming.

Jer