The tabs are showing up but the first list item is showing up in the middle instead of floating to the left edge of the parent unordered list.
I don't see what's holding it up and I can see the float: left in the styles. I'm using the Redmond Theme with no other modifications to the styles.
Inspecting the elements I can't see anything that has it starting in the middle of the interface, but at least a third of the width of the tabs titles area is lost on the left side.
The page is not online but here is: an image