Can't copy/move between filesystems with SFTP

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http://unix.stackexchange.com – Are there any limitations on SFTP that prevents a user from copying between filesystems? I have a SLES with SFTP, and users can't copy/move files between filesystems, even when the target is chmod 777-ed and the user is root -- Filezilla just says "failed". Creating a directory on the target filesystem works fine, as does copying/moving within a filesystem, and if the user SSHes in they can copy to the target filesystem no problem. There's no SELinux, AppArmor, grsecurity, etc. What could be the problem? (HowTos)