Comment # 1 on bug 1045375 from Neil Rickert

I can confirm this.

I logged into XFCE.  Then I tried to setup a new connection with
NetworkManager.  To do that, I right-clicked on the tray item, and selected
"edit connections".  Then I used "Add" to create a new connection.

It started out looking fine.  I entered the SSID, and gave the connection a
name.  Next, I clicked on the security.  As soon as I selected "WPA personal",
the "Save" button grayed out.  Entering the network key did not help -- it
stayed grayed out.  So I could not save the new connection.

I cancelled out of that.  I then tried another method.  I clicked on the icon,
to give a list of networks.  Then I clicked on the network that I wanted to
join.  I was expecting a window to pop up asking for the key.  Instead, my
desktop appeared to freeze for a minute or two.  And then I found myself back
at the login screen.  Presumably the session had crashed.