Simple IE6/7 CSS Problem

I am using the Zen theme and I want the title of the sidebar blocks to have a background color. So here is what I have:

.sidebar .title {
background-color: #d0d0d0;
}

This works fine with FF, but IE6 doesn't show the color in the first block in each sidebar. The background color shows for all the blocks below the first ones.

Any ideas what to do? I have tried to fix this for days now.

Thanks in advance
John