I use a Nikon D70 and shoot sports events on continuous shooting mode setting. Photos are in correct sequence when viewed on camera. When downloaded, photos are often out of sequence. Any suggestions as to how I might fix this problem? Thanks.
Yes, the problem is the sub-second time. Since the D70 shoots at 3 fps, no wonder some files end up having exactly the same time, up to the second. It's not clear, though, why wouldn't Lightroom use the filename as the second sorting criteria — that would ensure correct order, since cameras are numbering the files sequentially.
You have two options:
NOTE: If you'll be updating your catalog from v1 to v2, rather than importing the files in a fresh v2 catalog, you'll have to Save, then Read back Metadata for your D70 files, in order to ensure the subsecond information is actually read from files. That's because v1 didn't bother to read this info, so it's not there.