I think I can reproduce at least one of the problems reported here.
Under Edit Connections | Wireless I have several Wi-Fi networks listed
including my neighbor's, "BRINK", for which I don't have a password. (I
think that BRINK, unlike other neighbors' networks, is listed in the
Edit Connections | Wireless window because I once accidentally selected
that network from the list of available networks in the applet menu.
Note that I never connected to BRINK because I have never had the
password.)

If I select "BRINK" and click "Edit..." then I surprisingly get a
"Wireless Network Authentication Required" dialog even though I am now
at another location far far away from BRINK. I also get the Editing
window for BRINK.  See attached screenshot.

If I Cancel the authentication dialog or leave it open then the
"Save..." button in the Editing window is greyed out.

If I edit some bogus password into the authentication dialog then the
dialog goes away and the "Save..." button becomes ungreyed.

There are probably several different shortcomings in the UI, but one of
the most important shortcomings is that the "Save..." button is greyed
out and no reason is provided. Even if the user infers that some field
is invalid (e.g., no password has been entered), she is not told by NM
which field(s) is invalid.

** Attachment added: "After selecting %22BRINK%22 and clicking 
%22Edit...%22.png"
   
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/737615/+attachment/3229717/+files/After%20selecting%20%2522BRINK%2522%20and%20clicking%20%2522Edit...%2522.png

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https://bugs.launchpad.net/bugs/737615

Title:
  Can't save changes in "Edit Connections..." for Wi-Fi networks to
  which one doesn't have the password

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