Originally Posted by p1cunnin
UAL.com tells me that it is a known bug -- generally when you have a car and/or hotel on the end of your itinerary and you've booked through a third party travel agency.
That's it. I have to book all my travel through my company travel agency.....so no upgrading online for me. To bad for UA, since they will have to pay their agents to put in my upgrades.