Description of problem:
just trying to run the audio mixer

Version-Release number of selected component:
pavucontrol-2.0-7.fc21

Additional info:
reporter:       libreport-2.2.3
backtrace_rating: 4
cmdline:        pavucontrol
crash_function: gtk_box_pack
executable:     /usr/bin/pavucontrol
kernel:         3.16.1-300.fc21.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 gtk_box_pack at gtkbox.c:1479
 #1 MainWindow::createEventRoleWidget at mainwindow.cc:832
 #2 context_state_callback at pavucontrol.cc:456
 #3 pa_context_set_state at pulse/context.c:291
 #4 setup_complete_callback at pulse/context.c:497
 #5 run_action at pulsecore/pdispatch.c:279
 #6 pa_pdispatch_run at pulsecore/pdispatch.c:331
 #7 pstream_packet_callback at pulse/context.c:335
 #8 do_read at pulsecore/pstream.c:830
 #9 do_pstream_read_write at pulsecore/pstream.c:185