zfs send/recv: STILL invalid Backup Stream

TRYING to use zfs send/recv between a 10-STABLE and an 11-CURRENT 
system, and receive the non-descript
"invalid backup stream".

borg.lerctr.org /home/ler $ sudo bin/backup-TBH-ZFS-initial.sh
Password:
receiving full stream of zroot_at_2014-07-24 into 
zroot/backups/TBH_at_2014-07-24
received 41.7KB stream in 300 seconds (142B/sec)
receiving full stream of zroot/usr_at_2014-07-24 into 
zroot/backups/TBH/usr_at_2014-07-24
received 41.7KB stream in 1 seconds (41.7KB/sec)
receiving full stream of zroot/usr/local_at_2014-07-24 into 
zroot/backups/TBH/usr/local_at_2014-07-24
received 2.81GB stream in 1116 seconds (2.58MB/sec)
receiving full stream of zroot/usr/src_at_2014-07-24 into 
zroot/backups/TBH/usr/src_at_2014-07-24
cannot receive new filesystem stream: invalid backup stream
borg.lerctr.org /home/ler $ cat bin/backup-TBH-ZFS-initial.sh
#!/bin/sh
DATE=`date "+%Y-%m-%d"`
#DATE2=2013-03-24
#DATE2=`date -v "-1d" "+%Y-%m-%d"`
# snap the source
ssh root_at_tbh.lerctr.org zfs snapshot -r zroot_at_${DATE}
# zfs copy the source to here.
ssh root_at_tbh.lerctr.org "zfs send  -R -D  zroot_at_${DATE} | \
      ssh home.lerctr.org \"zfs recv -F -u -v -d zroot/backups/TBH\""
# make sure we NEVER allow the backup stuff to automount.
/sbin/zfs list -H -t filesystem -r zroot/backups/TBH| \
     awk '{printf "/sbin/zfs set canmount=noauto %s\n",$1}' | sh
borg.lerctr.org /home/ler $

This has been happening for YEARS and I can't seem to interest anyone in 
fixing it.

How can we get to the bottom of this?

borg.lerctr.org /home/ler $ uname -a
FreeBSD borg.lerctr.org 11.0-CURRENT FreeBSD 11.0-CURRENT #56 r268982M: 
Tue Jul 22 10:14:59 CDT 2014     
root_at_borg.lerctr.org:/usr/obj/usr/src/sys/VT-LER  amd64
borg.lerctr.org /home/ler $ ssh tbh uname -a
FreeBSD thebighonker.lerctr.org 10.0-STABLE FreeBSD 10.0-STABLE #39 
r269019M: Wed Jul 23 11:44:35 CDT 2014     
root_at_thebighonker.lerctr.org:/usr/obj/usr/src/sys/GENERIC  amd64
borg.lerctr.org /home/ler $

-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640 (c)     E-Mail: ler_at_lerctr.org
US Mail: 108 Turvey Cove, Hutto, TX 78634-5688