>I had troubles with LR3 not opening the D800 RAW files and >found that Adobe had an upgrade to the Camera Raw plugin. When >I downloaded it, it was a beta one but once installed, it was >happy to open the D800 sample files I wanted to look at in >both Photoshop and LR.
Downloading ACR should affect photoshop but not lightroom, where the ACR is built in and not (separately) upgradable. Unless that's a 4.0 change?
I asked over in Lightroomforums.net and no one has seen an issue, and success was reported there in opening D800 shots on LR4.