Progress bar with APC and Codeigniter - Trouble with IE and Chrome
I think this is a IE cache issue
try to flag $.ajax request parameters with cache set a false or/and add a timestamp to request
function checkProgress() { $.ajax({ type : "POST", url : "/fbe_upload/index.php/fbeupload/upload_progress?t=" + (new Date().getTime()), cache : false, // ....and add no-cache headers for /fbe_upload/index.php/fbeupload/upload_progress route
header('Expires: Tue, 08 Oct 1991 00:00:00 GMT');header('Cache-Control: no-cache, must-revalidate');