please keep problems related to d800 in one topic: http://nikonrumors.com/forum/topic.php?id=5517

mm Try download and instal VIEWNX2 last version ( 2.3.2) and import / develop your pics with this. If they still look weird ( blocked) then its the camera , otherwise its the software you are using ...

BTW at what magnification / crop are you looking at the puics when you see them "blocked" ?

moire patterns? probably what Gabbb is saying... Up the quality.

ElDudinerio said:
My d800 clusters boxes of 8x8 pixels in every Image. This makes it look more like a puzzle than a picture. We even reproduced this at Nikon HQ Switzerland. After two days they told me this was normal behaviour and a fault of my viewer Software - But its even visible on the LCD of the Camera itself. Could any kind soul please hit me with a bowling pin, if I didn' get a thing right or tell me if you had the same experience respectively how to convince Nikon to fix this issue?

Any help is appreciated by an absolute newbie.
I use win 64 with DxO 7.5.1, Lightroom 4.1 with Camera RAW 7.1.

What you see on your camera is a low resolution jpeg preview, I wouldn't be worried.

My d800 clusters boxes of 8x8 pixels in every Image. This makes it look more like a puzzle than a picture. We even reproduced this at Nikon HQ Switzerland. After two days they told me this was normal behaviour and a fault of my viewer Software - But its even visible on the LCD of the Camera itself. Could any kind soul please hit me with a bowling pin, if I didn' get a thing right or tell me if you had the same experience respectively how to convince Nikon to fix this issue?

Any help is appreciated by an absolute newbie.
I use win 64 with DxO 7.5.1, Lightroom 4.1 with Camera RAW 7.1.