Help application hangs when playing a video in NVIDIA hardware using the open source driver on a live session.

-Ubuntu release: Ubuntu 18.04.1 LTS

-Package version: 3.26.0-1ubuntu2

-What I expected to happen:

The videos about "Getting started with GNOME" should play without issues.

-What happened instead:

Instead of playing the videos the help application hangs until the WebKit process (/usr/lib/x86_64-linux-gnu/webkit2gtk-4.0/WebKitWebProcess) crashes.

I was able to reproduce this bug with NVIDIA hardware using the open source driver inside a live session, using AMD hardware or the proprietary NVIDIA driver causes no issue at all.

"lspci" info:

04:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2) (prog-if 00 [VGA controller])
 Subsystem: ASUSTeK Computer Inc. GT218 [GeForce 210]
 Flags: bus master, fast devsel, latency 0, IRQ 24
 Memory at dc000000 (32-bit, non-prefetchable) [size=16M]
 Memory at e0000000 (64-bit, prefetchable) [size=256M]
 Memory at de000000 (64-bit, prefetchable) [size=32M]
 I/O ports at e800 [size=128]
 Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: <access denied>
 Kernel driver in use: nouveau
 Kernel modules: nvidiafb, nouveau

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: yelp 3.26.0-1ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: ubuntu:GNOME
Date: Sat Sep 8 09:40:33 2018
ExecutablePath: /usr/bin/yelp
LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: yelp
UpgradeStatus: No upgrade log present (probably fresh install)