Wifi No Packets Received using rt2800usb

[nielsencfm]

I'm trying to use several TPLink 7200ND wifi/usb adapters connected to a BeagleBone running Arch Linux ARM (kernel version 3.2.21-3-ARCH). Since the BeagleBone can't supply enough power, they're connected through a powered usb hub.

Although I've used this exact setup on my desktop PC and a BeagleBoard-xM and had it work fine, I can't get the wifi adapter to receive packets:

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.10 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 fe80::92f6:52ff:fe0d:5269 prefixlen 64 scopeid 0x20<link>
ether 90:f6:52:0d:52:69 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 12 bytes 1152 (1.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Sometimes I can get some packets received when I have only 1 wifi adapter attached. But even then it's unpredictable.

I have installed the wireless_tools package, have an up to date rt2800usb driver which is loaded into the kernel properly when I insert the usb/wifi adapters. I can bring the wifi adapter up and there are no error messages in the kernel log:

[ 14.810093] usb 1-1.4.1: reset high-speed USB device number 7 using musb-hdrc
[ 14.934857] cfg80211: Updating information on frequency 2412 MHz for a 20 MHz width channel with regulatory rule:
[ 14.934895] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.934917] cfg80211: Updating information on frequency 2417 MHz for a 20 MHz width channel with regulatory rule:
[ 14.934941] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.934961] cfg80211: Updating information on frequency 2422 MHz for a 20 MHz width channel with regulatory rule:
[ 14.934985] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935005] cfg80211: Updating information on frequency 2427 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935028] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935048] cfg80211: Updating information on frequency 2432 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935072] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935092] cfg80211: Updating information on frequency 2437 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935115] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935135] cfg80211: Updating information on frequency 2442 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935159] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935179] cfg80211: Updating information on frequency 2447 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935202] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935222] cfg80211: Updating information on frequency 2452 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935245] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935265] cfg80211: Updating information on frequency 2457 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935288] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935309] cfg80211: Updating information on frequency 2462 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935332] cfg80211: 2402000 KHz - 2472000 KHz @ 40000 KHz), (600 mBi, 2000 mBm)
[ 14.935352] cfg80211: Updating information on frequency 2467 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935376] cfg80211: 2457000 KHz - 2482000 KHz @ 20000 KHz), (600 mBi, 2000 mBm)
[ 14.935396] cfg80211: Updating information on frequency 2472 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935419] cfg80211: 2457000 KHz - 2482000 KHz @ 20000 KHz), (600 mBi, 2000 mBm)
[ 14.935439] cfg80211: Updating information on frequency 2484 MHz for a 20 MHz width channel with regulatory rule:
[ 14.935462] cfg80211: 2474000 KHz - 2494000 KHz @ 20000 KHz), (600 mBi, 2000 mBm)
[ 14.942627] ieee80211 phy3: Selected rate control algorithm 'pid'
[ 14.956524] Registered led device: rt2800usb-phy3::radio
[ 14.959624] Registered led device: rt2800usb-phy3::assoc
[ 14.962589] Registered led device: rt2800usb-phy3::quality
[ 14.971009] usbcore: registered new interface driver rt2800usb

Also, the LEDs on the wifi adapters are blinking like they normally do when they're working.

Does anyone know where I should look next?

Thanks