d800 new firmware repaired the lock up issue
Modifications enabled in this version
When a still image was captured while viewing existing images in playback mode, the monitor turned off, the memory card access lamp glowed steadily, and, in some rare cases, the camera ceased to respond to operations. This issue has been resolved.
When the Wireless Transmitter WT-4 was used with certain settings applied, RAW images were also transferred when Wireless transmitter> Transfer settings> Send file as was set to JPEG only. This issue has been resolved.
A dark shadow sometimes appeared at the bottom edge of images captured with Active D-Lighting set to any option other than Off with Image area set to 5:4 (30x24). This issue has been resolved.
I have a Nikon D3 & D800 & Canon 5d mkii & Fuji X100
They get along just fine together.