I have an aMember site that works fine except when I click on the "Check For Uniqueness" link on the Signup page, nothing happens.... It should not be a browser setting or pop up window blocker, because when I visit other aMember sites, their "Check For Uniqueness" links works. Anybody have an ideas where to start looking. I have done a little changing on some fo the HTML but I don't think this would have killed this feature. Here is a link to the page that the "Check for Uniqueness" link is not working on: http://autotech-elearning.com/amember/signup.php Thanks in advance for any help on this. Update: This feature now works. The only thing I know I changed was the removal of the target="_top" attribute from the hypertext link of a header image placed in header.html.