I've used Knoppix 4 for a year and its been a joy to network: I click on kwifi and instantly I'm on the network with a handy graph for connection strength. I recently installed Knoppix 5.11 to the HD and after the first hour I'm afraid: "the network is unreachable". Kwlan reports "unable to configure wlan interface using iwconfig". I've been messing around with the command line to no avail. When I pop in Knoppix 4 I'm back on the network in seconds. What am I missing?

thank you
frank ross