Update: Eye-Fi has released a firmware update that fixes this issue.

If you shoot with a Nikon D800 or D800E and have been experiencing issues with wireless file transfers using Eye-Fi SD cards, it’s not just you: Eye-Fi has found that some aspect of the cameras’ SD slots make them incompatible with the cards.
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It’s been almost three months to the day since the well-respected camera equipment rating service DxOMark crowned the Nikon D800 as its new king, giving the camera’s 36.3MP sensor an incredible overall score of 95 — but now its reign is over. The Nikon D800 has been officially beaten out, and appropriately enough it has happened at the hands of its nearly identical twin brother, the Nikon D800E. Read more…