If you vote, or click a link or the \"next image\" arrow before the main image has completely finished loading, it\'ll be automatically reported as if the pic is no good (e.g. the submitter linked to a pic on their site but their server\'s hosed).
There used to be a computer in my lab which for some reason didn\'t like to completely load ANY image over a certain size, normally you\'d just get a partial image but on CMON it\'d load the next image and \"report as broken\".