This warning is telling:
file:///usr/share/webbrowser-app/webcontainer/WebappContainerWebview.qml:86:5: QML Connections: Cannot assign to non-existent property "onSamlRequestUrlPatternReceived"
It looks like the Google+ webapp is overriding the webview, in such a way that breaks the code flow.
I couldn't reproduce this bug: after logging in, I get a screen that says that my browser is not supported by Google+.
I collected the logs here: http:// paste.ubuntu. com/23494611/
This warning is telling: /usr/share/ webbrowser- app/webcontaine r/WebappContain erWebview. qml:86: 5: QML Connections: Cannot assign to non-existent property "onSamlRequestU rlPatternReceiv ed"
file://
It looks like the Google+ webapp is overriding the webview, in such a way that breaks the code flow.