This is slightly off-topic, as it is about F12, not Rawhide. However, it's a relatively recent failure in a full-updated D12, so it's not *too* far off-topic, I hope!
The problem is that neither amarok nor digikam nor rhythmbox will start up. rhythmbox does nothing. The two KDE application (run under Gnome and metacity) will put up a splash screen, and then hang.
In the case of digikam it looks like Phonon is waiting on gstreamer, based on a gdb stack-trace (with digikam compiled from source):
0 0x00d1a416 in __kernel_vsyscall () #1 0x007d2f25 in ppoll () from /lib/libc.so.6 #2 0x01f13e41 in gst_poll_wait () from /usr/lib/libgstreamer-0.10.so.0 #3 0x01f10ab6 in ?? () from /usr/lib/libgstreamer-0.10.so.0 #4 0x01f123b4 in ?? () from /usr/lib/libgstreamer-0.10.so.0 #5 0x01f1cfe9 in gst_update_registry () from /usr/lib/libgstreamer-0.10.so.0 #6 0x01ec90d2 in ?? () from /usr/lib/libgstreamer-0.10.so.0 #7 0x00e34100 in g_option_context_parse () from /lib/libglib-2.0.so.0 #8 0x01ec86fe in gst_init_check () from /usr/lib/libgstreamer-0.10.so.0 #9 0x027b5362 in ?? () from /usr/lib/kde4/plugins/phonon_backend/phonon_gstreamer.so #10 0x027b5781 in qt_plugin_instance () from /usr/lib/kde4/plugins/phonon_backend/phonon_gstreamer.so #11 0x06133df4 in QPluginLoader::instance() () from /usr/lib/libQtCore.so.4 #12 0x07d0e51b in ?? () from /usr/lib/kde4/plugins/phonon_platform/kde.so #13 0x07d0f791 in ?? () from /usr/lib/kde4/plugins/phonon_platform/kde.so #14 0x02513ee4 in ?? () from /usr/lib/libphonon.so.4 #15 0x02514d83 in Phonon::Factory::backend(bool) () from /usr/lib/libphonon.so.4 #16 0x0250ec9a in Phonon::GlobalConfig::audioOutputDeviceListFor(Phonon::Category, int) const () from /usr/lib/libphonon.so.4 #17 0x0250f500 in Phonon::GlobalConfig::audioOutputDeviceFor(Phonon::Category, int) const () from /usr/lib/libphonon.so.4 #18 0x0250a3b6 in ?? () from /usr/lib/libphonon.so.4 #19 0x0251adeb in ?? () from /usr/lib/libphonon.so.4 #20 0x0251b0f1 in Phonon::VideoPlayer::VideoPlayer(Phonon::Category, QWidget*) () from /usr/lib/libphonon.so.4 #21 0x082ef06a in Digikam::MediaPlayerView::MediaPlayerView ( this=<value optimized out>, parent=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/mediaplayerview.cpp:107 #22 0x08279ea0 in Digikam::AlbumWidgetStack::AlbumWidgetStack ( this=<value optimized out>, parent=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/albumwidgetstack.cpp:109 #23 0x082aee4e in Digikam::DigikamView::DigikamView ( this=<value optimized out>, parent=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/digikamview.cpp:215 #24 0x08295160 in Digikam::DigikamApp::setupView (this=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/digikamapp.cpp:493 #25 0x082a3933 in Digikam::DigikamApp::DigikamApp (this=<value optimized out>, __in_chrg=<value optimized out>, __vtt_parm=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/digikamapp.cpp:232 #26 0x083a24fa in main (argc=<value optimized out>, argv=<value optimized out>) at /home/bothner/Software/digikam-1.0.0-rc/digikam/main.cpp:172
rhythmbox also hangs in gstreamer.
One data-point which might be relevant: I briefly experimented with xmonad (if it had a less steep learning-curve, including better mouse support and easier defaults I might have stuck with it). After than the desktop icons are gone, and I can no longer open a terminal by right-clicking the desktop (nautilus-open-terminal). I'm not sure if the these failures predate or postdate the xmonad experiment, but it's possible that switching to xmodad might have done something nasty.