When you move with your mouse to the bread-crumb-trail of the site (e.g. the "Home" link), you can easily accidentaly move over the "Site navigation" fold-out menu. That menu immediately folds out and then covers the "Home" link...
Just a minor detail perhaps, and not one of the highest priority (improving the overall layout and look-and-feel of the site would be far higher on my list), but pretty annoying when you use the "Home" link frequently
