When no VPN plugins are installed and you run nm-connection-editor and click "Add" button to add a new connection, the editor crashes with error:
"Unknown type NMVpnPluginUiInterface specified in treemodel new_connection_combo_model"
The workaround is to install a VPN plugin.
network-manager-applet-0.9.7.0-3.git20121016.fc18 has been submitted as an update for Fedora 18.
Jirka says an automatic connection to wifi network works on LiveCD, but you can't set it manually. Might be a final blocker.
* should fix your issue,
* was pushed to the Fedora 18 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing network-manager-applet-0.9.7.0-3.git20121016.fc18'
as soon as you are able to.
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then log in and leave karma (feedback).
The update was pushed stable, and I just tested in Beta RC1, cannot reproduce - booting live desktop, running nm-connection-editor and clicking Add works fine. Closing.