New Site Collection - Users not resolving in people picker


We have successfully been using the FBA pack for years on a single site collection. We created a new site collection under the same web app that we have been using all along but with the new site collection, it is not recognizing the names to add to the site. I can view the accounts in the FBA User Management section but the Full Name is blank and the IsInSharePoint = No. I know this is because they haven't actually been added to the site collection. How can I add them to the site collection? The people picker won't recognize the accounts unfortunately. :( We'd appreciate any help you can give us.

For any users you want add to the site collection, you can simply edit the user on the user management page and click Save. Saving the user will add it to the site collection.