beryl core crashed

Binary package hint: beryl-core

I don't know what happend. After turning on my notebook beryl manager is running but there is an alert which says that beryl core crashed. Beryl-manager is running but the window manager is set up 'kwin'( I have Kde installed) instead of beryl.
My notebook is a 2 1/2 years old Compaq Presario R3000 with Intel P4 and an ATI Radeon 9000IGP with 128Mb of integrated memory and 1,2 GB of RAM

ProblemType: Crash
Architecture: i386
CrashCounter: 1
Date: Mon Apr 2 15:32:06 2007
DistroRelease: Ubuntu 7.04
ExecutablePath: /usr/bin/beryl
Package: beryl-core 0.2.1.dfsg+git20070318-0ubuntu2
PackageArchitecture: i386
ProcCmdline: beryl --force-aiglx
ProcCwd: /home/cri
ProcEnviron:
 LANGUAGE=it_IT:it:en_GB:en
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: beryl-core
StacktraceTop:
 doPoll (timeout=<value optimized out>) at display.c:1332
 eventLoop () at display.c:1896
 main (argc=2, argv=) at main.c:370
Uname: Linux cri-laptop 2.6.20-13-generic #2 SMP Sun Mar 25 00:21:25 UTC 2007 i686 GNU/Linux
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin plugdev scanner video