Flood of errors: "Cannot write permissions of ...ffs.tmp" when "Copy NTFS Permissions" is turned on

[Lion]

If I sync with copy-NTFS-permissions disabled, all goes well.
But if I turn that on, I get huge quantities of "Cannot write permissions of (fully-pathed name of a file being copied).fff_tmp.
Error code 5: Access is denied. (SetFileSecurity)"
I'm using an admin account, and starting FFS with "run as administrator" doesn't help either.
And it doesn't matter whether the destination is a local HD, a USB external HD or a network storage drive (WD MyBookWorld).
Adding *.ffs_tmp to the exclusion list doesn't help either.

[Zenju]

see also viewtopic.php?t=2151