I really don't think it's css margins, because the half-disappearing footer happens even when the users online mod template is completely removed from the layout, and also when I remove all css directly related to the uo-box. It also happens even when I move the user online template elsewhere in the layout.
You can see the layout here:
http://printcutncreate.com/shop/home.php?shopkey=lilac The dimension settings I set for the footer are all displaying correctly and the footer content is still there, it's just that the footer background (and the main content background--the scalloped image) disappear half-way down the footer.