Nikon D7100 firmware Update C 1.03 Available for Download.
Here is the list of the modifications
• Reduced noise (horizontal lines) in movies shot with 1280×720; 60p or 1280×720; 50p selected for Frame size/frame rate.
• Fixed an issue that sometimes caused the display to darken when images were viewed by pressing the (playback) button.
• Fixed an issue with the menus for some languages where continued scrolling would cause the camera to freeze.
• Fixed issues with the virtual horizon displayed using the Viewfinder virtual horizon option.
• Fixed an issue with the camera freezing when the Clean image sensor option was used.