[Plugin: s2Member® ( Membership w/ PayPal® )] Corrupted downloads

First and foremost, this plugin is simply awesome!! Great job guys! =)

Bumped into this small problem today. Seems like S2member is adding extra stuff in the header. Downloads made through s2member gets corrupted. If done in other ways, bypassing s2member (via direct link, ftp, etc), the download is perfect and fully functional.

Running on BlueHost servers.

Similar issues some of your customers have raised in the forum:
http://www.primothemes.com/forums/viewtopic.php?f=4&t=15426
http://www.primothemes.com/forums/viewtopic.php?f=4&t=6410

http://wordpress.org/extend/plugins/s2member/