Audacity froze

[William Ranvaud]

I was working on Audacity for a couple of hours already. The audio was playing and I clicked on the time line to listen just a couple seconds back and it froze, audacity window is a little darker and doesn't respond. All the rest of the computer is working fine.
I cannot reproduce, it looks like a one time bug. Once I forced the app to quit it could restore the information so nothing was lost.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: audacity 1.3.13-3ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
NonfreeKernelModules: nvidia wl
AlsaCards:
 0 [Intel ]: HDA-Intel - HDA Intel
                       HDA Intel at 0xdb500000 irq 46
Architecture: amd64
Date: Fri Aug 19 22:36:07 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 LANGUAGE=en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: audacity
UpgradeStatus: Upgraded to natty on 2011-06-30 (50 days ago)