This issue occurs in 1.0 but 2.0 may be affected as well.
Response sent from endpoint doesn't include any caching-related information, hence IE8 caches it, and if SWF component requests a new data portion, cached data is provided instead.

Fixed that by adding caching-related headers to the response in com.exadel.fiji.lifecycle.FijiPhaseListener.

                    response.addHeader("Pragma", "no-cache");
                    response.addHeader("Cache-Control", "no-cache");
                    // Stronger according to blog comment below that references HTTP spec
                    response.addHeader("Cache-Control", "no-store");
                    response.addHeader("Cache-Control", "must-revalidate");
                    // some date in the past
                    response.addHeader("Expires", "Mon, 8 Aug 2006 10:00:00 GMT");

Please check on your side if it also applies to current version...