kdenetwork and network scan

[Luca Ferrari]

Hi all,
I'm running kubuntu 7.04 with the last kde stable environment. I was used to 
run kdenetwork to configure my wifi and it worked pretty well, unitl one day 
I had to run it with the manual configuration (no dhcp) and after that I'm 
unable to set again the program to run on dhcp. If I try to set up the dhcp 
the program says me that the gateway is not valid (even if the field is 
empty) and I'm no more able to see the available networks with the right 
click. However my network card is working (I'm able to set it up from the 
command line). Anyone who knows how to solve the problem?

Thanks,
Luca