[toltion]

I find it's best to call the Extra field by it's name, not it's index. The index can change as you add/delete extra fields. Here's a sample of what I use and it works fine for me. The Name of my extra field is "No Ship AIR?" -

        {section name=field loop=$extra_fields}
        {if $extra_fields[field].field eq "No Ship AIR?"}
        {if $extra_fields[field].field_value ne ""}{$extra_fields[field].field_value}{/if}
        {/if}
        {/section}