Login problem with wireless network

I've recently installed 8.04 Desktop in its own partition on a Pentium 4 with D-link wireless PCI model DWL-G520. The system works fine except that when I restart I have to enter the network manager and reset the network security key. For unknown reasons the "key" seems to have been changed for another one with a lot more characters (the same key doubled perhaps?).
Is this a bug or is there a setting that I need to change?

Thanks

Ted Pritchard