(Atheros - AR2425) Not responding -- PARTIAL SOLUTION

The device/hw is detected and the driver is loaded (dmesg) :

----------------------------------------------------------------------------
[ 13.225872] ath5k 0000:05:00.0: PCI INT A -> Link[LK4E] -> GSI 19 (level, low) -> IRQ 19
[ 13.225882] ath5k 0000:05:00.0: setting latency timer to 64
[ 13.225948] ath5k 0000:05:00.0: registered as 'phy0'
[ 13.730199] Registered led device: ath5k-phy0::rx
[ 13.730222] Registered led device: ath5k-phy0::tx
[ 13.730232] ath5k phy0: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
----------------------------------------------------------------------------

...but it only scans/list the detected Wi-Fi networks, not responding when you try to connect to one of them (via Network Manager)

Also, through 'wpa-supplicant' using 'wext'/'nl80211' drivers, returns different errors :

----[wext-log]------------------------------------------------------------
root@blackbox:~# wpa_supplicant -D wext -i wlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument
Trying to associate with 00:21:63:59:6d:6e (SSID='MyRouterID' freq=2462 MHz)
Associated with 00:00:00:00:00:00
--------------------------------------------------------------------------

----[nl80211-log]---------------------------------------------------------
Trying to authenticate with 00:21:63:59:6d:6e (SSID='MyRouterID' freq=2462 MHz)
Trying to associate with 00:21:63:59:6d:6e (SSID='MyRouterID' freq=2462 MHz)
Associated with 00:21:63:59:6d:6e
WPA: 4-Way Handshake failed - pre-shared key may be incorrect
--------------------------------------------------------------------------

----[/etc/wpa_supplicant/wpa_suplicant.conf]------------------------------

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=root
network={
ssid="MyRouterID"
proto=WPA
key_mgmt=WPA-PSK
psk=92f83f70818f1463b3adfu5ue6d9a87igd75d3a2fb9c3392b35357a8
}
--------------------------------------------------------------------------

NOTE: The Wi-Fi Router passwd was 'forced' to the same I defined on the wpa_supplicant.conf to ensure there was no confusion.

NOTE2: The same hardware/Wi-Fi running on Ubuntu 11.10 works perfectly.