In my experience, it's must setting up url properly. I use PS 1.6.0.9
My setting "cron task manager" with "Cron Mode" Basic
Example not work:
http://www.domain.com/modules/gsitemap/gsitemap-cron.php?token=598048cfe0&id_shop=1'>http://www.domain.com/modules/gsitemap/gsitemap-cron.php?token=598048cfe0&id_shop=1
Then i change url to
http://www.domain.com/modules/gsitemap/gsitemap-cron.php?token=598048cfe0
I try secheduled and Voila, it's work