It could also be that your CACHE is clearing out out certain images Ian, then when a page loads instead of looking on the site for it it checks the CACHE (thats how they load real quick) however, if it does this and has cleared a few of the image files needed (ie, on the flames for boats, a king in chess etc etc) then they come up as a small square with red X meaning that image file cant be found, if you hit refresh i bet it will come up!!