I had an additional field in my 3.x version of amember that was displayed on the profile page that most users inputed a value into (integer). When I did the import, everything was ported over fine except this additional field was left blank for every user in the database. Is there something special I have to do for this?
Did you look inside the export file made from the previous version to make sure aMember 3 actually exported your custom field? I have a feeling, for custom fields, you may have to do a manual export/import of the custom field(s) from the SQL Database Interface (SQL myAdmin, etc.) directly instead of aMember.