[Koha] Empty file export.pl

Hello I am experiencing a strange problem with koha 3.4.4 on ubuntu 10.10, i get sn empty file when i try to export marc and items, from admin-- tools I have tried both marc and marcxml, i have reindexed zebra an everything seems to work propertly, but i only get emoty files from koha The interesting issue is that i have a copy of that server, that exports the data fine.... Anybody may suggest what is wrong? Kindest regards Enviado desde mi iPad, disculpen los errores tipográficos y ortográficos