In early March, Nikon offered a temporary fix to a lock up issue that had been plaguing the D4 and D800. At the time you had to turn off the ‘Highlights’ and ‘RGB Histogram’ display options to avoid the issue, but Nikon promised a more permanent fix was in the works. Good news, the fix is finally here in the form of Firmware Update B:1.01.
Besides fixing the lock up issue, the new update also offers solutions to a few other bugs including unexpected changes to aperture and exposure compensation when using certain custom settings and RAW files not being network transferrable when in JPEG only mode. More details including the firmware downloads for the D800 and D4 are ready for your downloading pleasure here and here, respectively.