Same NTFS problem with me. The size of the drive is properly displayed, but large files (above 2 GB) cannot be copied.
I am using an NTFS drive attached.
I can for sure say that the same drive works with no issues attached to a DD-WRD based router as storage if that might help.
I will probably try to convert it to ext, but proper support for NTFS would be great. So any new ideas ?