"Allow Existing Email" doesn't work. It used to work with WordPress 2.9.2 but since upgrading to WordPress 3.0 it doesn't.
I even waited to upgrade to WordPress 3.0 just because of Pie Register -and it is stated as been compatible with 3.0 now.
I need this sorted out desperately as I have users coming to my site daily trying to register multiple accounts. Any ideas???