I honestly don't know how so many people have so much trouble with the Account Management page. It works fine every time I log in, and I have multiple accounts open.
I don't have problems with the page myself. My friend had trouble because when he went to link his account to the master accounts it for some reason decided that all his UO accounts were now DAoC accounts... he never was able to get that settled... After at least 3months of trying to contact customer support he told me it was obvious to him that he's not meant to return.... told me to have a nice life and he'd not bother ****ing with EA anymore EVER. I can't say as I blame him. (Even tried contacting Mesanna but since he's a trucker and on the road all the time he really didn't have time to wait around for her to call him back.) At any rate he'll never return to UO.
Also... another friend had problems because everytime he put in his CC info it told him it was already in use. Which it wasn't. Wasn't his problem... it was the web page. He got extremely frustrated and gave up and resorted to buying the gametime cards... but since he had multiple accounts and not multiple CC's or emails he got mad because it would only let him buy one at a time and then Origin website told him he'd have to wait 30 days to buy another... almost lost a house over it. Again he was extremely angry and wanted to quit.
Had another friend who kept trying to link her accounts was successful with 3 but the 4th told her it was a DAoC account.... neither she nor my other friend ever played DAoC... she was angry as well ..... tried calling customer support but they told her they don't do UO and she'd have to use the website to contact UO. She couldn't get the website to work ..... it wouldn't let her get to the area where she could contact support. Infact it totally didn't show it at all. I'm assuming this had something to do with her web browser thinking it had "unsafe" content on it and was blocking it. I ended up going thru the website to contact customer support asking them to "call me"..... and then told them to call her. Giving them her number to call. This pissed them off at me. But I tried to explain the problem with her internet and all and they were pretty ticked off at me and told me never to do that again. They did finally call her... but I'm guessing it marked my account somehow. Anyway I decided after that ... that it's just not worth the bother trying to help anyone.
As for me..... I don't do anything wrong on their stinking site either yet 3 to 4 times a year they will attempt to bill my CC from some foreign country resulting in denial from my CC company and on a few occasions resulting in having my CC blocked an entire weekend so I can't get cash or buy anything or put gas in my car just because they can't seem to bill me from the country I live in. Even though CLEARLY on the website I live in the US.
So I'm happy for you that you don't have any of those issues. However a vast majority of other folk have had issues either in the past or present and to NO FAULT of their own.