Ubuntu Checkbox isn't responding

[Eli]

I did a system test (using the application "Checkbox"), so I quickly went through all the settings (with all of the stuff checked). It said it would play a sound, and it did. I clicked "pass." Then it was going to play a tone using internal speakers, so I unplugged my headphones, and it didn't play, so I hit "fail." Then, it went to testing the microphone ("audio/alsa_record_playback_external"), which I hit "start the test," but forgot to speak. So, I tried hitting what looked like the back arrow, after it played an air sound. I now realize that I never had a microphone plugged in in the fist place now, but I hit "start the test" again, and now it is stuck on a circular, orange loading animation with "Start the test" in white, and its bar in gray.

I know it's not being just slow, because it's been stuck on loading for this whole period of time it took me to write this (a few minutes).

In case Ubuntu-bug command (from commandline) hasn't auto-attatched info on my machine already:
I am using Ubuntu Desktop LTS 16.04, on an AMD processor.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: qmlscene 5.5.1-2ubuntu6
ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
Uname: Linux 4.4.0-62-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Feb 20 14:36:32 2017
ExecutablePath: /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene
InstallationDate: Installed on 2016-10-24 (119 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 XDG_RUNTIME_DIR=<set>
SourcePackage: qtdeclarative-opensource-src
UpgradeStatus: No upgrade log present (probably fresh install)