Scrolling With Bootstrap Produces Narrow Header

I'm using DataTables 1.9 with Bootstrap2. I've read the articles on getting it up and running and everything has been working great until I had vertical scrolling. When I do this I get the following look: https://dl.dropbox.com/u/116330/Screen%20Shot%202012-06-16%20at%208.06.00%20PM.png

My table is initialized like so:

$('#scenarioDomainTable').dataTable({
    "bScrollCollapse": true,
    "bPaginate":false,
    "sScrollY": "200px",
    "bSort":false,
    "bInfo":true,
    "bAutoWidth":false
  });