Description of problem:
My first Problem was: I can't start (no more) my VM via KVM (virt-manager)
I search arround, found a HowTo on fedoraprojekt. I install "yum install @virtualization" and reboot
caja and also mate-notification hangs - my Menue in Mate Desktop hangs
a new reboot (hard reset!) and after the hard reset ABRT came up 

Version-Release number of selected component:
mate-notification-daemon-1.10.0-1.fc22

Additional info:
reporter:       libreport-2.6.0
backtrace_rating: 4
cmdline:        /usr/libexec/mate-notification-daemon
crash_function: _g_log_abort
executable:     /usr/libexec/mate-notification-daemon
global_pid:     2222
kernel:         4.0.5-300.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 _g_log_abort at gmessages.c:315
 #3 dconf_shm_open at dconf-shm.c:87
 #4 dconf_engine_source_user_reopen at dconf-engine-source-user.c:76
 #5 dconf_engine_source_refresh at dconf-engine-source.c:57
 #6 dconf_engine_acquire_sources at dconf-engine.c:203
 #7 dconf_engine_get_state at dconf-engine.c:314
 #8 dconf_engine_watch_fast at dconf-engine.c:815
 #9 g_settings_read_from_backend at gsettings.c:1096
 #10 g_settings_get_value at gsettings.c:1144
 #11 g_settings_get_string at gsettings.c:1730