Please disable property deprecation warnings in F22, for example: (mhgui:4622): GLib-GObject-WARNING **: The property GtkSettings:gtk-button-images is deprecated and shouldn't be used anymore. It will be removed in a future version. They are probably not useful to end users, I don't think.
Thanks. They should be now gone in glib2-2.44.1-2.fc22.
glib2-2.44.1-2.fc22 has been submitted as an update to Fedora 22. https://bodhi.fedoraproject.org/updates/FEDORA-2015-16338
glib2-2.44.1-2.fc22 has been pushed to the Fedora 22 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'dnf --enablerepo=updates-testing update glib2' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2015-16338
glib2-2.44.1-2.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.