In searching for interesting award space, united.com fails to show available seats on anything but simple round trips, for example, I can see BF availability on EWR-IST on Dec 27, 2012, if I do a simple r/t search, but if I try searching for multiple destinations, with the first leg as EWR-IST, it shows no availability (not even standard awards) for Dec 27.

How are we supposed to deal with that, UA Insider?

-David