I have this problem intermittently.. I have a folder with CR2 files and their corresponding XMP files. I select a few CR2s, right click on one and select "Copy To" and I copy them to another folder. Most of the time it copies my XMP with it. Once in a while it doesn't. And it's weird because if I look at the destination folder right away, the CR2s still have those little circular icons on them indicating that I edited or cropped in ACR, but as I watch, the icons disappear from the CR2s in the new destination folder and the changes I made in ACR also disappear as I watch. Any ideas? Thansk in advance.
I purged the cache and that solved the problem..