asterisk users - Jun 2013 - Upgrading to 11.4.0 and ast_channel_make_compatible_helper: No path to translate

Hi

After upgrading from 1.4 to 11.4.0, I *am* able to receive calls
and direct them to extensions via defined trunks.

However, when making outgoing calls I receive the following error:

-- Executing [000441111111 at default:4]
Dial("SIP/fixedline-00000004",
"SIP/mydevice/00441111111,60,w") in new stack
   == Using SIP RTP CoS mark 5
     -- Called SIP/mydevice/00441111111
 WARNING[13053][C-00000002]: channel.c:6164 ast_channel_make_compatible_helper:
No path to translate from SIP/mydevice-00000005 to SIP/hardphone-00000004
  == Spawn extension (default, 00441111111, 4) exited non-zero on
'SIP/fixedline-00000004'.
  == MixMonitor close filestream (mixed)

And when I try to try to initiate a call with a manager script, I receive an
authentication error from the script.

How might I find more info to help diagnose either or both of these issues?

-- 
Eric Smith