Unable to create virtual machine; installation from .iso fails

[Christopher Kyle Horton]

Whenever I try to create a virtual machine in Boxes, I can get all the way through loading the boot menu from the given .iso file (in my case, attempting to create an Ubuntu Server 14.04.2 LTS 64-bit virtual machine on my Ubuntu GNOME 14.04 LTS 64-bit host OS), but after hitting the Enter key to select the the option to install, Boxes backs out to the main screen and just shows a blank black rectangle in the upper left corner.

See attachments: I included both a screencast of the issue in action, and a text file containing errors when doing those steps while running via gnome-boxes >> boxes_errors.txt 2>&1 .

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-boxes 3.8.4-1
ProcVersionSignature: Ubuntu 3.13.0-51.84-generic 3.13.11-ckt18
Uname: Linux 3.13.0-51-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Apr 30 18:03:29 2015
InstallationDate: Installed on 2014-10-19 (193 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-boxes
UpgradeStatus: No upgrade log present (probably fresh install)

[Krzysztof Wierzbicki (kriswierzbicki)]

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5125 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5166 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5167 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5168 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5169 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5170 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5171 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5172 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5173 was not found when attempting to remove it

(gnome-boxes:3484): GLib-CRITICAL **: Source ID 5174 was not found when attempting to remove it
Boxes-Message: machine.vala:147: display openSUSE-Leap-42.1-DVD-x86_64.iso disconnected

(gnome-boxes:3484): Boxes-WARNING **: libvirt-machine.vala:351: Failed to get information on 'openSUSE-Leap-42.1-DVD-x86_64.iso
My terminal output when I tray to use gnome-boxee