alwayson causes assertion

I don't know if anyone mentioned that so far, but looks like setting 
alwayson to 1 for passthrough driver ends always with assertion. I tried 
three different operating systems and it's always the same. Strangely 
enough, I had no such problem with cameracompress driver. How they differ 
inside?!

example cfg file that always fails:

driver
(
   name "passthrough"
   requires ["vlab.pjwstk.edu.pl:6888:blobfinder:0"]
   provides ["blobfinder:0"]
   alwayson 1
)

result:
Registering driver
Player v.3.0.2

* Part of the Player/Stage/Gazebo Project 
[http://playerstage.sourceforge.net].
* Copyright (C) 2000 - 2009 Brian Gerkey, Richard Vaughan, Andrew Howard,
* Nate Koenig, and contributors. Released under the GNU General Public 
License.
* Player comes with ABSOLUTELY NO WARRANTY.  This is free software, and 
you
* are welcome to redistribute it under certain conditions; see COPYING
* for details.

accepted TCP client 0 on port 6888, fd 3
listening on 6665
Listening on ports: 6665
player: /root/psg3/src/player-3.0.2/libplayercore/message.cc:717: 
MessageQueue* QueuePointer::operator->(): Assertion `Queue' failed.

Whenever I set alwayson to 0, it starts fine, I can connect playerv to it, 
subscribe and all blobfinder data are rendered correctly!

example cfg file that works fine:

driver
(
   name "cameracompress"
   requires ["vlab.pjwstk.edu.pl:6888:camera:0"]
   provides ["camera:0"]
   alwayson 1
)

Paul

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