1.5.0-beta-1: Strange error on loadUI startup

I just installed the latest build of LoadUI 2.1.0 and got this very error. It appears it may have resurfaced. I'm running this on XP and here's the log file:
Java Web Start 10.1.0.8
Using JRE version 1.7.0_01-b08 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\nmccormick
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
0-5: set trace level to <n>
----------------------------------------------------
Detected from bootclasspath: C:\\Program Files\\SmartBear\\loadUI-2.1.0\\jre\\lib\deploy.jar
Launching loadUI Build: nightly-30 2012-06-27_11-55-31
Opening splash...
Jul 18, 2012 1:32:41 PM com.eviware.loadui.fx.JavaFXActivator$1Local$21$1Local$19 doit$$18
SEVERE: JavaFX Bundle started!
Jul 18, 2012 1:32:46 PM com.eviware.loadui.fx.JavaFXActivator$1Local$21$1Local$19 doit$$18
SEVERE: JavaFX Stage created!
log4j:WARN No appenders could be found for logger (com.eviware.loadui.fx.WindowControllerImpl).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Configuring log4j from [C:\Program Files\SmartBear\loadUI-2.1.0\soapui-log4j.xml]
13:32:53,529 INFO [SoapUI] Adding [C:\Program Files\SmartBear\loadUI-2.1.0\.\ext\aaa-restws-security.jar] to extensions classpath
13:32:53,545 INFO [SoapUI] Adding [C:\Program Files\SmartBear\loadUI-2.1.0\.\ext\aaa.jar] to extensions classpath
13:32:54,060 INFO [DefaultSoapUICore] initialized soapui-settings from [C:\Documents and Settings\nmccormick\soapui-settings.xml]
13:32:54,467 WARN [SoapUIProGroovyScriptEngineFactory] Missing scripts folder [C:\Program Files\SmartBear\loadUI-2.1.0\scripts]
13:32:55,170 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/xop.xsd with targetNamespace http://www.w3.org/2004/08/xop/include
13:32:55,217 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/XMLSchema.xsd with targetNamespace http://www.w3.org/2001/XMLSchema
13:32:55,217 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/xml.xsd with targetNamespace http://www.w3.org/XML/1998/namespace
13:32:55,217 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/swaref.xsd with targetNamespace http://ws-i.org/profiles/basic/1.1/xsd
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/xmime200505.xsd with targetNamespace http://www.w3.org/2005/05/xmlmime
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/xmime200411.xsd with targetNamespace http://www.w3.org/2004/11/xmlmime
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/soapEnvelope.xsd with targetNamespace http://schemas.xmlsoap.org/soap/envelope/
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/soapEncoding.xsd with targetNamespace http://schemas.xmlsoap.org/soap/encoding/
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/soapEnvelope12.xsd with targetNamespace http://www.w3.org/2003/05/soap-envelope
13:32:55,232 INFO [SchemaUtils] Added default schema from /com/eviware/soapui/resources/xsds/soapEncoding12.xsd with targetNamespace http://www.w3.org/2003/05/soap-encoding
ShellTUI: No standard input...exiting.
-> Framework started!
Jul 18, 2012 1:33:26 PM com.eviware.loadui.fx.MainWindow$1Local$29 doit$$28
SEVERE: Deferring MainWindow action...
Jul 18, 2012 1:33:26 PM com.eviware.loadui.fx.MainWindow$1Local$29 invoke$
SEVERE: Showing MainWindow..
Jul 18, 2012 1:33:27 PM com.eviware.loadui.launcher.api.SplashController closeSplash
INFO: Closing splash...
Jul 18, 2012 1:33:36 PM com.eviware.loadui.fx.MainWindow$1Local$29 invoke$
SEVERE: MainWindow shown!
Creating boxes
Root box is: <html id="" class="">
We have 20 boxes
Layout for 578px
Resulting size: 582x510 (Viewport 580x508)
Updating viewport size
Resulting size: 582x510 (Viewport 580x508)
Positioning for 582x510px
13:34:03,309 INFO [DefaultSoapUICore] Importing preferences from [C:\Documents and Settings\nmccormick\soapui-settings.xml]
13:34:03,309 INFO [HttpClientSupport$Helper] Updating keyStore..
13:34:03,403 INFO [WsdlProject] Loaded project from [file:/C:/Projects/RESTfulWebServices/src/test/soapui/Battery-Quote-REST-Service-soapui-project.xml]
13:34:03,637 WARN [SoapUIProGroovyScriptEngineFactory] Missing scripts folder [C:\Program Files\SmartBear\loadUI-2.1.0\scripts]
13:34:47,464 ERROR [AbstractTestRunner] Exception during Test Execution
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
C:\Projects\RESTfulWebServices\src\test\soapui\groovy\SecuritySetup.groovy: 3: unable to resolve class javax.xml.bind.DatatypeConverter
@ line 3, column 1.
import javax.xml.bind.DatatypeConverter
^

1 error

at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:302)
at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:854)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:544)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:493)
at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:306)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:287)
at groovy.lang.GroovyShell.parseClass(GroovyShell.java:731)
at groovy.lang.GroovyShell.parse(GroovyShell.java:743)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:578)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:627)
at groovy.lang.Script.evaluate(Script.java:219)
at groovy.lang.Script$evaluate.callCurrent(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:46)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:133)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:141)
at Script1.run(Script1.groovy:4)
at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:96)
at com.eviware.soapui.support.scripting.groovy.SoapUIProGroovyScriptEngineFactory$SoapUIProGroovyScriptEngine.run(SourceFile:89)
at com.eviware.soapui.impl.wsdl.testcase.WsdlTestCase.runSetupScript(WsdlTestCase.java:932)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.runSetupScripts(AbstractTestCaseRunner.java:197)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.internalRun(AbstractTestCaseRunner.java:108)
at com.eviware.soapui.impl.wsdl.support.AbstractTestCaseRunner.internalRun(AbstractTestCaseRunner.java:42)
at com.eviware.soapui.impl.wsdl.support.AbstractTestRunner.run(AbstractTestRunner.java:135)
at com.eviware.loadui.components.soapui.SoapUISamplerComponent$SoapUITestCaseRunner.run(SoapUISamplerComponent.java:730)
at com.eviware.loadui.components.soapui.SoapUISamplerComponent.sample(SoapUISamplerComponent.java:575)
at com.eviware.loadui.impl.component.categories.RunnerBase.doSample(RunnerBase.java:507)
at com.eviware.loadui.impl.component.categories.RunnerBase.access$700(RunnerBase.java:68)
at com.eviware.loadui.impl.component.categories.RunnerBase$Worker.run(RunnerBase.java:774)
at com.eviware.loadui.util.dispatch.CustomThreadPoolExecutor$Worker.run(CustomThreadPoolExecutor.java:198)
at java.lang.Thread.run(Unknown Source)