Have a look at your C3 settings, you may have accidentally enabled the new 'Simplified User Interface.'
From the r67 release notes:
[quote:q2dr9d1a]First of all we have a new Simplified user interface mode. It hides advanced plugins, behaviors, properties, and event features, allowing you to focus on a clean and simple set of features. This is intended for education customers, especially with younger students. Simply open Settings and enable the new Use simplified user interface setting.