Qdbusviewer hangs on "org.freedesktop.ReserveDevice1.Audio0"

Steps to reproduce:

1) start jackd2
2) start qdbusviewer
3) click "org.freedesktop.ReserveDevice1.Audio0"

Now qdbusviewer hangs, after a while showing this error message:

"Error: Call to object / at org.freedesktop.ReserveDevice1.Audio0: org.freedesktop.DBus.Error.NoReply (Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.) failed"

Expected methods to show up in the right pane just as for every other object.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: qt4-dev-tools 4:4.7.0-0ubuntu4.2
ProcVersionSignature: Ubuntu 2.6.35-23.40-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic x86_64
Architecture: amd64
Date: Mon Nov 29 13:06:48 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100826)
ProcEnviron:
 LANG=sv_SE.utf8
 SHELL=/bin/bash
SourcePackage: qt4-x11