[panel] Indicators missing if panel is started while Compiz is running

[<anonymized>]

Binary package hint: unity-2d

If unity-2d-panel is started while Compiz is running, indicators do not appear. Instead, a window titled "<unknown>" appears and vanishes quickly. That window either
 1. is the height of the panel and contains the panel background
 2. is maybe 100-200 pixels high and contains the panel background several times, tiled.
It has a width of also about 100-200 pixels. I didn't manage to capture a screenshot yet, unfortunately.

The single legacy system tray icon is broken as well, it appears on the far left of the panel, on top of the Ubuntu button. The icon works, though sometimes the icon itself doesn't display correctly.

This does seem related to https://bugs.launchpad.net/unity-2d/+bug/718512 and https://bugs.launchpad.net/unity-2d/+bug/703542, but I think it's a different issue since it appears to be inherently linked to Compiz. If the panel is launched while Metacity or no window manager is running, it works. Similarly, if the panel is running and Compiz is launched, it keeps working. If the panel is then killed and restarted, it doesn't work anymore. I've tried the workaround described here: https://bugs.launchpad.net/unity-2d/+bug/703542/comments/11, but it didn't change a thing.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity-2d 3.8.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Sat Apr 23 18:10:29 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_DE:en
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-2d
UpgradeStatus: Upgraded to natty on 2011-04-22 (0 days ago)

[<anonymized> (fkrull-deactivatedaccount)]

For what it's worth, this program exhibits what I assume to be the same behaviour. When started with Metacity running, it shows an embedded Gtk button, when Compiz is running, it doesn't. Compile with "g++ `pkg-config --cflags --libs gtk+-2.0 QtGui` qt-gtk-embed.cpp".