Ae CC 13.0, Windows 7 / 64.
My Ae media browser shows icons with file names - but no thumbnails - and the right clip import option is greyed out. Same for all file types. File directory and All supported file types are selected in the filter menus.
These are known issues with the Media Browser panel in After Effects. You can import items by double-clicking or dragging into the Project panel.
We don't currently recommend the Media Browser for most After Effects users, as it provides little additional functionality over existing import methods. It was added to After Effects for compatibility with Adobe Anywhere, and lacks some of the capabilities available in Premiere Pro. Feel free to test it, and please report problems or requests for improvements here: http://adobe.ly/feature_request
Windows 7 64. After Effect cc 2015. GeForce 560 Ti