Thank you for reply. For these 10 days, I could not access 'sales' page. And did not try other pages, but top page have no problem. But I can't specify which file is wrong and which is good. IE access 10 to 20 jpg files simultaneously, and once it meet problemed format file, whole access stuck out. Thus the page without any jpg file is displayed, and accessing indicater continuously shows it is downloading jpgs, for a whole day.