If you see a shiny new navigation and side bar in the Google Analytics page, do not think that it is an error or that some style sheet has failed to upload. It is a design tweak rolled out by Google Analytics to give a fast and easy analysis to the users.
The new tab is less bright orange and more gray in shade. It is a cleaner and glossier modification of the earlier version. In a post on Google+ about the new design, Google Aanlytics said,
“Some of you may have noticed a shiny new nav and sidebar inside of Analytics. If you're not seeing it yet, you will over the next few weeks. We think this is a simpler and more beautiful way to present your reports, dashboards and will make your analysis easier and faster.”