I decided to try LR3 beta. Overall impression - very good, but I am stuck with one problem. It successfully copied manually added IPTC data, but all the camera info is lost.

Question: is it that I am doing something wrong, or it is LR3 bug, or common LR problem?

And question unrelated to LR: will I have any problems with empty-info (camera, date, etc.) photo uploads to any sites?

Are you 100% sure the EXIF is gone? If you click the view drop-down menu at the top of the Metadata panel and choose EXIF do you see any data at all?

http://grab.by/258z

The Beta is an early beta and full of bugs, but I hadn't stumbled on that one. I wouldn't use the Beta for anything more than test driving.

This is double-interesting. The data is not gone, but it became invisible for Nikon software. And more, several of exported files Nikon (View, Capture) can view, but cannot modify any metadata.