This is so weird. On my MacPro running SL, 1Password 3, and Dropbox (where I keep my agilekeychain), I have several bank logins for the same bank, but different accounts. Ditto for my MacBook Pro, using the same agilekeychain.
On my MacPro, when I double-click a login in 1PW, it opens the window in my browser. Yes, I do need to make sure I close the first bank tab before I double-click another login for the same bank, or I'll get the first login again. Slightly annoying, because sometimes I'm looking at a couple of accounts at the same time, but I'll live.
On my MacBook Pro, when I double-click another bank login, it keeps opening the first login I used for the bank. For example: User id: "MyPersonalAccount". Over and over. Even if I want "MyBusinessAccount." Even if I've logged out and closed the site. Even if I close the browser and open it again. I still get the first login.
It works just fine on the Mac Pro if I go back to it. I spent several minutes doing this the other day, trying to problem-solve it.
One difference between the two machines: The MacPro has a clean install of SL. The MacBook Pro has an overlay install of SL.