Space between primary tabs & content area.

I'm encountering this as well, in Chrome (21.0.1180.60 m), on all pages.

Looks like this style in the CSS is ever so slightly generous:

#header {
  background-color: #56B3E6;
  height: 10.846153em;
}

Removing the height prompts the #header region to assume a natural height appropriate to its contents in my Chrome, though I'm assuming the style was added for a reason (presumably because some browser did not correctly calculate the height of the contents, due to floats or some such).

Setting it to 10.7em seems to be about the right height ... at least, on normal zoom and (as mentioned) in Chrome.

No gap visible in IE9, Firefox 14.0.1, Safari 5.1.7 or Opera 11.61.

That screenshot doesn't work any more. Let's re-open if it can be reproduced and we get a new screenshot.

Well, it looks fine to me now, I suspect it got fixed. That, or it was a temporary Chrome glitch...