My workflow is to copy the files from the card to the internal HDD with finder. Then browse the files in Bridge, opening them in Camera RAW when edits need to be made.
This was working until I reset bridge recently due to some cache corruption (which was resolved by the reset). Now, on my latest import when I open the files in Camera RAW, make changes and press done an *.xmp is created, however this file does not contain the changes I made (to white balance, exposure, sharpness, cropping etc). As a result of this, the icon which indicates changes does not show in bridge and when I open the file in Camera RAW again the changes are missing.
Oddly, this problem is only applicable to my latest import - the files which I had imported previously still work within the same workflow. So it appreas there's possibly something wrong with the permissions on the newly created files.