Vanguard.com uses a 2 step login procedure. First you type your login ID, and then it opens a new page where you type in your password. Most of the time, 1Password doesn't open the Vanguard site and I am left to manually type both User ID and PW. Occasionally, it does work, but I have no understanding when and why it works. Other sites work fine, but the Vanguard.com site is the one I most want to have work with 1Password, since I have my financial accounts there.
It seems to work fairly well with my iPad and iPhone, but on my Mac, it rarely works.
What do I need to do to make it work properly on my Mac. I am currently running OSX Mountain Lion, v10.8.5.