Are you sure that nothing is rendering, or have you killed ColdFusion? When you dump the results of list(), you’re dumping an array of 20 entities, whose entire relationship structure will be composed as well.
Depending on the complexity of your entities, you could be trying to dump something that is MASSIVE and may never render. I’ve simply timed out trying to do this.
Try limiting the amount of data dumped (writedump( var=results, top=1), and see what happens.