Que raro ahora me sale:
Warning: Cannot add header information - headers already sent by (output started at /usr/local/psa/home/vhosts/portalcancun.com/httpdocs/index.php:8) in /usr/local/psa/home/vhosts/portalcancun.com/httpdocs/encuesta.php on line 6
Warning: Cannot add header information - headers already sent by (output started at /usr/local/psa/home/vhosts/portalcancun.com/httpdocs/index.php:8) in /usr/local/psa/home/vhosts/portalcancun.com/httpdocs/encuesta.php on line 7
esas lineas son en donde insertas el cookie que raro.