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System hang when using networkmanager

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https://bbs.archlinux.org – I've recently switched from Ubuntu to Arch on the recommendation of a friend.  I'm happy with most things, but cannot seem to get networkmanager to cooperate.  It works fine on my home network (WPA2), but causes the entire system to hang whenever I attempt to connect to my university's unencrypted public wifi.  The entire system becomes unresponsive (cannot open/close windows), and trying to sudo anything hangs (including rc.d stop networkmanager).  The only thing I can do is sudo su and edit /etc/rc.conf as root to remove the networkmanager daemon, then hard (HowTos)