rendering issue in IE7

i've noticed that when loading my test site in IE7 ( http://test.amigos.org ) that the blocks don't render properly. sometimes you must reload several times to get it to render properly. don't have this problem in other browsers... i have altered the theme, obviously, using the over-ride css file: local.css, and am using the views module for the block on the right-hand side. the block on the left-hand side is a simple un-ordered list...

any ideas how where i can look to correct this problem?