Can't access sub folders in NAS virtual directory

I can stream files in the root of a NAS drive (/nas_dir), but not in any of the sub folders (/nas_dir/sub/). FMS has read/write permission to all the files on the NAS but all i get is "stream not found" when I access anything in the sub folders (streams play fine from the root of the NAS)

FMS is running on rh5.4

Any feedback is appreciated.

Thanks

jason