jdownloader GUI from script crashes suddenly

[Victor D]

The program while is runing (a download job) suddenly crashes.
This wasn't happened with my previous Ubuntu 8.04,
enlightenment e17, and fedora 13.

If you need more information I can't figure out right now, please contact me. Thanks!

Usually I run the program through the shell script provided by jdownloader as:

$ ~/jdownloader/jd.sh

I attached a bug report file that was automatically generated. Moreover
I included the last part of the standard and error output
from the terminal:

a previous bunch
.
.
.
Plugins: /jd/plugins/hoster/DatPiffCom.class
Plugins: /jd/plugins/hoster/XHamsterCom.class
Key not found: gui.menu.action.premiumview.addacc.tooltip Defaultvalue: action.premiumview.addacc
Key not found: gui.menu.action.premiumview.removeacc.tooltip Defaultvalue: action.premiumview.removeacc
Key not found: gui.menu.action.premium.buy.tooltip Defaultvalue: action.premium.buy
Found branches on http://update0.jdownloader.org/:
last09
xmas

~/jdownloader/.jd/config/WEBUPDATE.cfg (No such file or directory)
OS Filter: /windows_createlog.bat
OS Filter: /jd/plugins/hoster/UploadMachineCom.class
OS Filter: /jd/plugins/hoster/Mach2UploadCom.class
OS Filter: /windows_restore.bat
OS Filter: /plugins/jdshutdown/windows/shutdown.exe
OS Filter: /plugins/jdshutdown/windows/cygwin1.dll
OS Filter: /tools/Windows/unrarw32/unrar.exe
OS Filter: /tools/Windows/unrarw32/cygwin1.dll
OS Filter: /tools/Windows/kikin/ins_en.png
OS Filter: /tools/Windows/kikin/kikin_installer.exe
OS Filter: /tools/Windows/kikin/ins_de.png
OS Filter: /tools/Windows/kikin/kikin.png
OS Filter: /tools/Windows/kikin/installer.version
OS Filter: /tools/Windows/uninstall.reg
OS Filter: /tools/mac/unrar2/unrar
PreDupeChecked: no mirror found!
PreDupeChecked: no mirror found!
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007fb6dfde2b12, pid=7968, tid=140422621538064
#
# JRE version: 6.0_18-b18
# Java VM: OpenJDK 64-Bit Server VM (16.0-b13 mixed mode linux-amd64 )
# Derivative: IcedTea6 1.8.1
# Distribution: Ubuntu 10.04 LTS, package 6b18-1.8.1-0ubuntu1
# Problematic frame:
# V [libjvm.so+0x5d8b12]
#
# An error report file with more information is saved as:
# ~/jdownloader/.jd/hs_err_pid7968.log
#
# If you would like to submit a bug report, please include
# instructions how to reproduce the bug and visit:
# https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
#
jdownloader/jd.sh: línea 70: 7968 Cancelado java -Xmx512m -jar JDownloader.jar