"Settings" hangs when scanning for WiFi since JB update on One X
I am using the same version of the OS on my HTC One X and I have never had this problem before. So I am thinking this is maybe a problem concerning the hardware of your phone. Maybe you should contact HTC for this problem. They can probably help you some more.

But you could always try to do a hard factory reset (this is something which HTC support will ask to do too) . Because an update doesn't really reset anything. A factory reset should reset all settings, this to make sure it isn't a problem of your settings. Before you do a factory reset, make sure you have a backup of everything.