Thanks for your replies. I found a bug in one of my translated files, a missing " in list_adress.php. The search works fine now.
PHP Code

<?php
$ubbt_lang['MY_ADDRESS'] = "Vælg en modtager";
$ubbt_lang['CLOSE'] = Luk";
$ubbt_lang['CLOSE_X'] = "[x]";
?>


trosfrihed.dk
Custom Ubb 7.5.2