xscorch crashes kubuntu

It keeps producing this error:

The font "fixed" does not support all the required character sets for the current locale "LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=en_US.UTF-8;LC_ADDRESS=en_US.UTF-8;LC_TELEPHONE=en_US.UTF-8;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=en_US.UTF-8"

It runs very slowly and after a short while it causes kubuntu to crash and reboot.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xscorch 0.2.1-1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Wed Oct 26 11:49:16 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/games/xscorch
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SourcePackage: xscorch
UpgradeStatus: Upgraded to oneiric on 2011-09-13 (43 days ago)