I have the same problem, but i have fixt it. The problem is the country you choose when you install Revit 2014. Some countries is included with templates and libraries. First time i install Revit 2014 and choose country is Netherlands. But Families Library it's empty. So i uninstall it. When i install Revit 2014 and country as United Kingdom, i got all families and rfa and rvt files.
Hope have help you.
Do not just accept the initial defaults when installing. If you click on the down arrow at the product in the installation window, the window will expand to show the product options available. I installed in the United States, but chose to include content (Libraries and Templates) from a number of other countries as well. See attached image.
Hey Guys I had the same problem, the first time I installed revit 2014 I had my internet connection off. Once it was installed the content was empty. I tried updating by adding features and it still didn't work. I uninstalled it and reinstalled it again with the internet connection on and once that was done, everything was their. The entire library, I even noticed with having the internet on while installing took hours to install. I hope this works, for anyone that had the same problem as me.