soapUI 4.0.0 is completely unresponsive

davisp@ThinkPad-T410:~/Downloads/soapui-4.0.0$ ./bin/soapui.sh 
================================
=
= SOAPUI_HOME = /home/davisp/Downloads/soapui-4.0.0
=
================================
13:27:15,148 INFO  [DefaultSoapUICore] initialized soapui-settings from [/home/davisp/Downloads/soapui-4.0.0/soapui-settings.xml]
13:27:16,114 INFO  [SoapUI] Used java version: 1.6.0_25
Exception in thread "XpcMessageLoop" java.lang.RuntimeException: java.io.FileNotFoundException: Library libgthread-2.0 not found at any known locations !
 at com.jniwrapper.linux.utils.LinuxLibraryLoader.<init>(LinuxLibraryLoader.java:90)
 at com.jniwrapper.gdk.GdkMultithreading.<init>(GdkMultithreading.java:48)
 at com.jniwrapper.gdk.GdkMultithreading.getInstance(GdkMultithreading.java:35)
 at com.jniwrapper.gtk.GTK.initialize(GTK.java:97)
 at com.teamdev.xpcom.a.b.a.a.<init>(Unknown Source)
 at com.teamdev.xpcom.XpcMessageLoop.<init>(Unknown Source)
 at com.teamdev.xpcom.XpcMessageLoop.getInstance(Unknown Source)
 at com.teamdev.xpcom.b$a.run(Unknown Source)
Caused by: java.io.FileNotFoundException: Library libgthread-2.0 not found at any known locations !
 ... 8 more

davisp@ThinkPad-T410:~/Downloads/soapui-4.0.0$ locate libgthread-2.0
/usr/lib/i386-linux-gnu/libgthread-2.0.so.0
/usr/lib/i386-linux-gnu/libgthread-2.0.so.0.2800.6