When shrinking the browser window size (specifically the width) the 'Search All Categories' field gets overlapped by the login and location text and eventually disappears altogether...
Also I notice on my laptop resolution I can't access the advanced search controls at all because the scroll bar is there but it's too narrow to see what's in that box even if I click on it. Perhaps if the size gets too small a master scroll bar should appear in the whole search window and not just the advanced section?