I have a form and enabled "No duplicates" on the email address field. However, this now blocks some email addresses that are unique and after searching the entries those addresses are NOT found in the form entries, so they should not be blocked.
Using Gravity Forms 1.7.6 and Wordpress 3.5.2.
The form in question has about 5430 entries containing unique email addresses.
Do you know what can cause this problem?