This morning it's working for me for the first time in a couple weeks. I tried getting there a new way - from the Program Information screen, selecting 1K benefits, then upgrades at the bottom there is a link to log on to the E-Upgrade section. This worked. I logged out and tried again from the Mileage Summary - it worked as well. If you're still having a problem, log off and follow this route and see if you have better luck. It forces you to log on to ua2go.com directly, rather than passing log on information through a session ID, which i think is/was part of the problem.