I had the same problem but on the new Studio 15 ( 1550) using the 5100 wifi 
card. 
Updating through the ubuntu packages from linuxwireless.org did not help. (Did 
not try loading the latest patches by compiling from source).
The problem was related to the n-mode, switching it off works as a work-around 
until the firmware gets updated:

create (or modify) iwlagn.conf:

sudo gedit /etc/modprobe.d/iwlagn.conf

and add:

options iwlagn 11n_disable=1
options iwlagn 11n_disable50=1

-- 
[iwlagn] networkmanager applet cannot connect to WPA2 home network.  Neither 
can WICD.
https://bugs.launchpad.net/bugs/348275
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