Has anyone seen issues like this with a library-sharing setup?

Problem in a nutshell:
======================
If a backup job uses the media server storage unit (i.e. one that uses
the "remote robot") it stays queued without ever going active.

Background:
===========
master and media server are solaris boxes
running NBU DC 3.4

They are both connected to a qualstar 4/12/180 tape library
with 6 AIT-2 drives

drives 1-5 are cabled to the master server, as is the robotic control.
drive 6 is cabled to the media server.

tpconfig on the master server
=============================
root@master[14]> tpconfig -l
Device Robot Drive       Robot                    Drive  Device
Type     Num Index  Type DrNum Status  Comment    Name  Path
robot      2    -    TL8    -       -  -          -     /dev/sg/c3t0l0
  drive    -    0    8mm    1      UP  -          rmt1  /dev/rmt/1cbn
  drive    -    1    8mm    2      UP  -          rmt7  /dev/rmt/7cbn
  drive    -    2    8mm    3      UP  -          rmt0  /dev/rmt/0cbn
  drive    -    3    8mm    4      UP  -          rmt3  /dev/rmt/3cbn
  drive    -    4    8mm    5      UP  -          rmt5  /dev/rmt/5cbn


tpconfig on the media server
============================
root@media[9]> ./tpconfig -l
Device Robot Drive       Robot                    Drive   Device
Type     Num Index  Type DrNum Status  Comment    Name    Path
robot      2    -    TL8    -       -  -          -       master
  drive    -    0    8mm    6      UP  -          drive4  /dev/rmt/4cbn


and there happens to be some weird
output when running robtest from the
master server...  (but that could just be
because the master server doesn't have drive
6 defined)
====================================
root@master[19]> robtest

Robot Selection
---------------
  1)  TL8 2
  2)  none/quit
Enter choice: 1
 
Robot selected: TL8(2)   robotic path = /dev/sg/c3t0l0
 
Invoking robotic test utility:
/usr/openv/volmgr/bin/tl8test -r /dev/sg/c3t0l0 -d1 /dev/rmt/1cbn -d2
/dev/rmt/7cbn -d3 /dev/rmt/0cbn -d4 /dev/rmt/3cbn -d5 /dev/rmt/5cbn 
 
Opening /dev/sg/c3t0l0
Enter tl8 commands (? returns help information)
s d
drive 1 (addr 63000) access = 0 Contains Cartridge = no
  SCSI ID from drive 1 is 1
drive 2 (addr 63001) access = 0 Contains Cartridge = no
  SCSI ID from drive 2 is 2
drive 3 (addr 63002) access = 0 Contains Cartridge = no
  SCSI ID from drive 3 is 3
drive 4 (addr 63003) access = 1 Contains Cartridge = yes
  Source address = 16 (slot 17)
  Barcode = A00086                          
  SCSI ID from drive 4 is 4
drive 5 (addr 63004) access = 1 Contains Cartridge = yes
  Source address = 46 (slot 47)
  Barcode = A00001                          
  SCSI ID from drive 5 is 5
drive -62992 (addr 7) access = 0 Contains Cartridge = no
READ_ELEMENT_STATUS complete