[Andreas]

We had the same problem and solved it this way:

In register.php

Find

PHP Code:

     $profilefields = $DB_site->query("
         SELECT maxlength, profilefieldid, required, title, size, type, data, optional
         FROM " . TABLE_PREFIX . "profilefield
         WHERE editable = 1 


Change it to

PHP Code:

     $profilefields = $DB_site->query("
          SELECT maxlength, profilefieldid, required, title, size, type, data, optional
          FROM " . TABLE_PREFIX . "profilefield
          WHERE editable = 1 OR required<>0 


Find

PHP Code:

 $profilefields = $DB_site->query("
         SELECT *
         FROM " . TABLE_PREFIX . "profilefield
         WHERE editable=1 AND required <> 0
         ORDER BY displayorder
 "); 


Change it to

PHP Code:

 $profilefields = $DB_site->query("
          SELECT *
          FROM " . TABLE_PREFIX . "profilefield
          WHERE required <> 0
          ORDER BY displayorder
  ");