Crashes on 64-bit linux

I downloaded the binary zip for linux, and on first startup, it complained about not running on a 64-bit JVM. So I removed the "-d32" flag from the JAVA_OPTS in soapui.sh. On the next start, the application starts up normally, first with a splash screen and then the main application window, and promptly crashes with a hotspot error. I've tried three separate JVMs:

• OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-0ubuntu1.11.10.2)/OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)


• Java(TM) SE Runtime Environment (build 1.6.0_29-b11)/Java HotSpot(TM) 64-Bit Server VM (build 20.4-b02, mixed mode)


• Java(TM) SE Runtime Environment (build 1.7.0_03-b04)/Java HotSpot(TM) 64-Bit Server VM (build 22.1-b02, mixed mode)

The hotspot errors all look roughly the same:

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f839d4e35f1, pid=10315, tid=140203431413504
#
# JRE version: 6.0_23-b23
# Java VM: OpenJDK 64-Bit Server VM (20.0-b11 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea6 1.11pre
# Distribution: Ubuntu 11.10, package 6b23~pre11-0ubuntu1.11.10.2
# Problematic frame:
# C  [libgconf-2.so.4+0x175f1]  gconf_enum_to_string+0xc01
#
# An error report file with more information is saved as:
# /home/andy/hs_err_pid10315.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/
#

I'm guessing that it is trying to read a config file stored by soapui 4.0.1 somewhere, but there's just not much info in the logs on what is going on. Anybody else try running this on a 64-bit JVM?