She has AdBlockPlus activated. She also has Ghostery activated.
She's not sure which one it is, but one or the other generates a pop up list of what is being blocked and what isn't in the bottom left hand corner of the laptop screen every time she opens a page on MN.
Up until a couple of days ago, when she did an advance search, that pop up list would obscure a bit of the left hand side of the boxes where you enter the search criteria. Now, it doesn't. The pop up list is several mms to the left of the boxes.
That says to Zombie that something is squeezing the main area of the site.