Hello. I initialize uploader using core:
...
var uploader = new plupload.Uploader({
            runtimes: "flash,html4", //"html5,flash,html4",
            browse_button: config.BrowseButton,
            //upload_button: config.UploadButton,
            container: config.Container,
            max_file_size: config.MaxSize,
            url: FileUploadManager.GenerateSubmitUrl(),
            flash_swf_url: config.SwfFile,
            drop_element: config.DropPanel,
            filters: config.Filters == null ? [] : config.Filters
        });

        uploader.init();
...

It code excellent works in Chrome, FF! But when I open my page in IE8, I get an error every time: "Unknown runtime error" which references to plupload.flash.js file.
(my browser has installed flash player).

What I do wrong? or it's not my mistake?;))