Our laboratory ordered 15 sets of Gumstix Over Air with Palo35 ad Robovero extensions. 3 of them doesn't connect to Wi-Fi. 
When I run ifup wlan0 i get the following: 

root@overo:~# ifup wlan0
ADDRCONF(NETDEV_UP): wlan0: link is not ready
ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
Internet Systems Consortium DHCP Client V3.1.2p1
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/wlan0/00:19:88:42:88:41
Sending on   LPF/wlan0/00:19:88:42:88:41
Sending on   Socket/fallback
DHCPDISCOVER on wlan0 to port 67 interval 7
DHCPREQUEST on wlan0 to port 67
bound to -- renewal in 84340 seconds.

then pinging to google gives me this:

PING www.google.com ( 56(84) bytes of data.
From icmp_seq=7 Packet filtered
From icmp_seq=16 Packet filtered
From icmp_seq=50 Packet filtered

Best wishes, 
Ainur Begalinova
Laboratory Assistant 
Robotics Department
School of Science and Technology 
Nazarbayev University Research and innovation Systems
+7 7172 706278