if you have only one effect that you want to loop you can use the following code:
import com.jumpeye.Events.FLASHEFFEvents;
fe.addEventListener(FLASHEFFEvents.TRANSITION_END, endHdl);
function endHdl(evt:FLASHEFFEvents)
{
fe.show();
}
fe is the instance name of your FlashEff component.