I was trying to book a flight on UA.com last night and had all kinds of issues.
1) When conducting an award search, clicking a different date on the calendar would result in a "we were not able to conduct your search request" error message. This was not a complicated itinerary or anything (DEN-EWR)... Tried to do it both as a one-way and as a roundtrip search. Very frustrating to have to start from square one every time I changed the date.
2) One of the itineraries that came up was on a 739. The seat map looked like a 739 in Y (with only DEF seats in row 7 and lav at the front of Y), but only showed 2 rows of F. Is this the new F8 739 configuration ?

I hope they get this stuff figured out soon... Very frustrating.