Comment 1 for bug 1244113

Some additional info. This is what you see when you start the googleplus webapp in a terminal:

/.local/share/applications$ unity-webapps-runner -n 'R29vZ2xlKwA=' -d 'plus.google.com' %u
** Message: Launching webapp 'Google+' with the webapp container (command line 'webbrowser-app --app-id='Googleplusgooglecom' --webapp='R29vZ2xlKwA=' --enable-back-forward')
mariva00@kb-eliot:~/.local/share/applications$
WARNING: This project is using the experimental QML API extensions for QtWebKit and is therefore tied to a specific QtWebKit release.
WARNING: The experimental API will change from version to version, or even be removed. You have been warned!

Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon/manifest.json"
Invalid webapps installation found: "/usr/share/unity-webapps/userscripts/unity-webapps-amazon"
Could not open manifest file: "/usr/share/unity-webapps/userscripts/unity-webapps-googleplus/manifest.json"
Invalid webapps installation found: "/usr/share/unity-webapps/userscripts/unity-webapps-googleplus"
QQmlExpression: Expression file:///usr/share/webbrowser-app/Browser.qml:337 depends on non-NOTIFYable properties:
    unity::action::qml::ActionManager::globalContext
Empty path in webapps model search path update request