[Ultima]

I'm going to need you to be a little more specific than "it's not working."

How so? Does it not do anything after clicking the button/link? Is there an error message? Does it appear to be loading but it doesn't?

Sometimes, if you (and/or the other person involved in the trade) have a large inventory, the trades will "break" and load painfully slow. And if you're on a public server like a school's, it will not load heavy pages and instead "gives up" and gives an error message. I'm sure someone like Coda can explain better, but this is the best I can do for now ^^;