problem scanning wifi lans

[Luca Ferrari]

Hi all,
I've got a curios problem: when using the wifi from the network manager applet 
the card works fine, but if I try to run it from the command line I can neither 
do a normal scan:

root at fluca-laptop:~# lspci | grep Wi
05:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
root at fluca-laptop:~# iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

wmaster0  Interface doesn't support scanning.

wlan0     No scan results

pan0      Interface doesn't support scanning.


No scan results for wlan0 but the applet shows me all the APs in the 
neighbourhood...any idea?

Thanks,
Luca