Problem with wpa_supplicant

[R. G. Newbury]

Has anyone else noticed a problem with wireless authentication using 
wpa_supplicant? Following a router change and consequent messing with 
passphrases, my Thinkpad with iwl4965 chipset has ceased to 
authenticate. It can easily connect with the wireless router if the 
router is 'open' but fails on WEP, WPA and WPA2. The household's mac 
airbook, ipad, iphone and android phone have no difficulty.

I have tried deleting all /etc/sysconfig/network* files, as well as 
those in wicd and wpa_supplicant and recreating but no joy.

Interestingly, the psk reported by a 'iwlist wlan0 scan' for my router 
is nothing like the psk produced by 'wpa_passphrase essid 
mysecretpassphrase'

scan: 1382882a0e39633131ca70df0db2a9bff9a8f142d47cdde921740e27aea26c77
wpa_passphrase: 
f389062374809e11f7c30b39b6e34f221b311a963dcb866a318bcee1e4ce0337

Anyone have any idea what's going on?
Fedora 17 on 3.5.5.-1, wpa_supplicant, wpa_supplicant-1.0-1.fc17.x86_64