Ok, so your are moving a folder with files on the HDA then. Did you enable mount shares locally with Greyhole?
http://wiki.amahi.org/index.php/Mount_Shares_Locally
This is the warning on the wiki page:
Important Warnings
You should never change or delete files in the shared directories (/var/hda/files/* by default) directly on the HDA, using the terminal, or the Gnome file browser, for the shares for which you checked the Uses pool option in the Amahi dashboard. If you want to work with files on Greyhole shares on the HDA, you should Mount Shares Locally.
You should be safe reading existing files directly, or adding new files directly, as long as don't care that your new files will only be moved into the storage pool during the next check, which runs automatically at midnight (or manually using greyhole --fsck). Until then, your new files will be stored in your shared directories (normally /var/hda/files/share_name/).
Also, touching anything inside the gh directories that Greyhole creates at the root of your partitions is a recipe for disaster.
When you mess with files in shares on the HDA, you need to have this running.