We recently fell foul of the Flash v10 issue whereby the user has to click the AjaxUploader special warning object to browse for files. This was undesirable, so we switched to IFrame mode.
If UploadType="IFrame" is set to true, however, you get a 2nd browse button appear beside your originally delegated one.
To reproduce this, use FireFox and load up the simple-upload.aspx sample. Be sure to set UploadType="IFrame".
If you know of any way around this, that would be great.
Simon