Brasero failed to burn CD after asking to eject.

[Newfie]

Summary:

I tried to burn a CD image (a Linux ISO) using Brasero. After getting to 39%, it asked me to eject the disk. After ejecting, it gave an error and I had to close. This ruined the CD as it was not completed.

Reproduce:

1) Start Brasero
2) Select "Burn Image"
3) Set write speed to 4x in Properties
4) Select an ISO (I used a GNOME demonstration iso)
5) Start the burn and grab a coffee.
6) Eventually asks you to eject the disc, where it will then exit with an error.

Brasero Log attached.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: brasero 3.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Thu Apr 5 18:14:31 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120308)
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: brasero
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Onno Steenbergen (osteenbergen)]

Same problem, my session logs include lines like:
BraseroReadom called brasero_job_get_output_type
BraseroReadom stderr: addr: 640 cnt: 128