I have windows 7 in a Bootcamp partition. Windows is kept up to date, as is 1Password, Windows version. (I had the beta box checked on in the 1Password preferences but I turned it off to see if it made any difference to the following problem, which it didn't. Since I had the beta running in the first place, I'll mention the issue here.}
If I'm totally signed out of Google News, 1Password fills in the Google ID and password with no problem. If IE9 (or whatever) has remembered my ID and only presents a password box to be filled in, I eventually get the following message:
Internet explorer is denying access to a <frame> because it is on some other domain.
I usually run IE9 in a Parallels Windows 7 VM. In the VM, I'm always either fully signed in or fully signed out of Google News.
I don't see an IE9 option that only fills in the ID but not the Password and don't know what's filling it in in my Bootcamp version. Anyway, 1Password Windows isn't able to cope with that little window requesting password only