Cannot connect to router wirelessly after upgrading to wheezy

[vialaspada]

After upgrading to wheezy, I am no longer able to connect either of my two wireless routers using the D-Link DWA-131 802.11n Wireless N Nano Adapter(rev.A1). One router is visible and one is not. To keep things simple, I'd like to start out trying to connect to the visible router.

Code:
# uname -a
Linux debian 3.2.0-4-686-pae #1 SMP Debian 3.2.57-3+deb7u1 i686 GNUL/Linux

# lsusb
...
... D-Link System DWA-131 802.11n Wireless N Nano Adapter(rev.A1) [Realtek RTL8192SU]
...

# lsmod
...
r8712u...
...

# cat /etc/network/interfaces
...
auto wlan0
iface wlan0 inet static
pre-up wpa_supplicant -B -Dwext -i wlan0 -c /etc/wpa_supplicant.conf
wireless-essid MY_ESSID
address 192.168.254.204
netmask 255.255.255.0
gateway 192.168.254.254
default gateway 192.168.254.254
dns-nameservers 8.8.8.8 24.205.192.61 192.168.254.254
post-down killall -q wpa_supplicant

# cat wpa_supplicant.conf
network={
ssid="MY_ESSID"
psk=LONG_HEX_STRING
key_mgmt=WPA_PSK
}
The contents of dmesg and kern.log are mostly
Code:
...wlan0: direct probe to... timed out
Please let me know if I need to provide any more information.

Also, I just realized that this thread belongs in the wireless internet forum. Is there a way to move the thread?

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