I do not have any encrypting in my wlan (if you have, disable it first and 
check without). I can change essid with iwconfing and get ip with dhclient. 
Then network works and computer is not freezing or crashing.
 
Do you see wlan0 with iwconfig?

Change essid:
sudo iwconfig wlan0 essid NAME

Check messages:
dmesg | grep acx

Read dmesg carefully, it first say:
acx: firmware image 'tiacx100c0D' was not provided. Check your hotplug script
But it then should find tiacx100 and tiacx100r0D and say: uploaded firmware 
'Rev 1.9.8.b'

-- 
acx driver dropped from kernel
https://bugs.launchpad.net/bugs/495077
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