I just got my D800 yesterday, unboxed it, took maybe about 10 shots and started receiving an "err" error and the whole camera would lockup. I would have to shutdown the cmaera and pull the battery. To put it mildly, I was quite dismayed!!! I ended up switching SD cards and haven't had the issue appear again yet, but i also haven't taken too many more shots yet. At any rate, has anyone else experienced this with the D800??? Other information- The "problematic" SD card works perfectly fine in my D7000, and always has. I also had an 85mm f/1.4D lens attached- and yes the aperture lock is set correctly...
Hope that it's just a matter that it doesn't like that particular SD card for some reason- it's a 64Gb Lexar 133x Class 10.