Audacity can't multitask

While exporting, I would like to open another Audacity window and work on another track. I currently can't do this as all Audacity windows are stuck on hold until the export completes.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: audacity 2.0.0-1
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic-pae 3.2.11
Uname: Linux 3.2.0-19-generic-pae i686
AlsaCards:
 0 [Intel ]: HDA-Intel - HDA Intel
                       HDA Intel at 0x88320000 irq 50
ApportVersion: 1.94.1-0ubuntu2
Architecture: i386
Date: Sun Mar 18 19:09:48 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120210)
ProcEnviron:
 LANGUAGE=en_CA:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: audacity
UpgradeStatus: Upgraded to precise on 2012-03-17 (1 days ago)