Attached Link: http://www.renderosity.com/viewed.ez?galleryid=532250&Start=1&Sectionid=3&filter_genre_id=0&WhatsNe

lo i had this problem just now lol, after a lot of looking and trying to find out why it was like that i noticed that when i made the alpha the white background colour was just off white and thats what made the plane shw up in the volumetric atmos. so i made the background totlay white and that seems to have sorted the problem out follow link to see image