Quite bizarre. Several days ago, I changed my password and picked those blasted security questions (NO I DON"T REMEMBER MY MOST FAVORITE FOOD AS A CHILD...and yes, I could just decide to use "purple" as the answer).

Today, I went to check my reservations, and out of habit entered the old password. The website showed me all my Mileage Plus account stats, but "Manage Reservations" would show me reservations only one by one and only if I entered the confirmation numbers.
When I finally remembered the new password, and signed with it - poof! the usual list of all reservations.
Interesting data point about the back office integration of the different modules.