Segmentation fault when starting audience

When starting audience I get the following error:

pim@chaos ~ $ audience
[INFO 14:16:14.403456] [Application:74] Audience version: 0.1
[INFO 14:16:14.403584] [Application:76] Kernel version: 3.3.6-hardened-r1
[WARN 14:16:14.427410] [Gtk] Theme parsing error: gtk-widgets.css:200:23: 'px' is not a valid color name
[WARN 14:16:14.427602] [Gtk] Theme parsing error: gtk-widgets.css:201:23: 'px' is not a valid color name
[WARN 14:16:14.427867] [Gtk] Theme parsing error: gtk-widgets.css:231:23: 'px' is not a valid color name
[WARN 14:16:14.428016] [Gtk] Theme parsing error: gtk-widgets.css:232:23: 'px' is not a valid color name
[WARN 14:16:14.502335] [Gtk] Theme parsing error: button.css:164:23: 'px' is not a valid color name
[WARN 14:16:14.502507] [Gtk] Theme parsing error: button.css:165:23: 'px' is not a valid color name
[WARN 14:16:14.514673] [Gtk] Theme parsing error: content-view.css:62:23: 'px' is not a valid color name
[WARN 14:16:14.514858] [Gtk] Theme parsing error: content-view.css:68:23: 'px' is not a valid color name
[WARN 14:16:14.515068] [Gtk] Theme parsing error: content-view.css:80:23: 'px' is not a valid color name
[DEBUG 14:16:14.527945] [Settings:155] Loading settings from schema 'org.pantheon.Audience'
Segmentation fault
pim@chaos ~ $

The backtrace with gdb gives this:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff73d7b27 in gtk_icon_info_load_symbolic ()
   from /usr/lib64/libgtk-3.so.0
(gdb) bt
#0 0x00007ffff73d7b27 in gtk_icon_info_load_symbolic () from /usr/lib64/libgtk-3.so.0
#1 0x000055555556cd1b in audience_widgets_button_set_icon ()
#2 0x000055555556cf17 in audience_widgets_button_construct ()
#3 0x0000555555570689 in audience_widgets_top_panel_construct ()
#4 0x0000555555563486 in audience_app_construct ()
#5 0x0000555555566a30 in _vala_main ()
#6 0x0000555555566aa9 in main ()

Audience from trunk with Gtk+ 3.4.3 build on Gentoo Linux Hardened x64.