For a few months I've been having problems with nefs that I edit, add metadata and rename in PhotoMechanic 4.4.3.2. I then apply my corrections in ACR (Photoshop CS, Camera Raw 2.4) in XP environment. Everything is fine if I go back to work on the files later. Weird things happen, however, when I copy the files in PhotoMechanic to another folder. When I open these files in ACR, some of the previews revert back to the default settings even though the XMP files have the corrected versions. It happens to random images in the new folder. If I process them to jpegs, the ones with the default previews convert uncorrected and the images with correct previews convert corrected even though they all have the identical corrections to the raw file listed in the xmp file. Somehow the xmp is being unlinked from the nef--filenames are the same but for some reason some of them aren't being recognized. If I then correct them again, they stay corrected unless I copy them to another folder with PhotoMechanic and then they may or may not transfer without defaulting back to the original as shot.
David