Well, I'm completely at a loss to know what is currently happening. After getting real time display of captured packets working on both ATI based systems, my download finished on the Nvidia based system. I shut it down and booted the Knoppix 5.0.1 DVD (same disc as before). I went through he start-up pricedure exactly as I had on the two ATI systems. And when I told it to capture packets, this time the screen came up in real time capture mode. I'm at a loss to know what is different now; I did this several times a few hours ago and it failed consistently. I even saw the failure with 4.0.2 DVD (which was completely unexpected), the the sucess with an old Knoppix 3.2 and then the failure yet again with 5.0.1. Why it s working now I have no idea. I plan on looking into this further, but that's best put off until I get some sleep.

Thanks very much for the feedback and testing on your system Rusty, without it I would have believed the fault was with Knoppix and not kept at it.