Hi,
Because my thread-title
http://www.audiocircle.com/index.php?topic=98559.0 does not cover the discovered problem anymore I start this new topic.
With assistance of Bonjour Browser I can show in a more technical way, what I have run in to: Whenever I power on the BDP-1, it kills Airplay to the Marantz Na7004.
Beginning: BDP-1 off, notice both Http and AirTunes NA7004

BDP-1 on, immediately after power on

BDP-1 on, after a little while, notice NA7004 is gone, both in AirTunes and Http, which is completely gone, both machines listed there before (pic1) are now invisible.

What surprises me, but that most likely has to do with my non-extensive knowledge of Bonjour, is that the BDP-1 is only listed under Workgroup-manager.
At least it never shows in the Browser-pane of Safari, so Bonjour has some kind of problem with the BDP-1.
hope this helps, and points someone out there to a solution....
Marius