Whats up with this...

When I boot my system off the Knoppix live CD and then plug a thumb drive into the USB port the thumb drive is auto-populated on the desktop and everything works great.

However, after installing Knoppix ti the HDD (debian install) absolutly nothing happens when a thumb drive is attached. Nothing is even found in system:/media or /dev.

Could someone please explain to me why this works when running from the live CD and not with a HDD install and how to get knoppix to continue to auto-populate the thumb drive on the desktop after an HDD install?

Thanks.