.flv video plays sound, but not its video

programming flash
1

I call a .flv into my movie like this:

var nc:NetConnection = new NetConnection();
nc.connect(null);

var ns:NetStream = new NetStream(nc);

newVid.attachVideo(ns);

ns.play("test.flv");

Simple with no buffering. I have published with both Flash 8/AS 2, and Flash 7/AS 2.

Any ideas why the sound, but not the video plays?

Thanks for your thoughts.