IE CSS problem

I cant get the IE CSS to work. I tried to add the following to IE CSS:

.atb-leftSidebar h3{
color: green;
}

then in the leftSidebar i have:

h3.test

When it's in the Custom CSS, it works for both Firefox and IE. When it's only in the IE CSS, the h3 text color is black. I have tried IE7 and IE6. All the CSS Options are "true". The conditional statement is the default: if gte IE 5.5000
I am running Confluence 2.7.1 and Theme Builder 3.0.0.b27