10.5 EAP hangs on Startup

Running Windows XP, Idea hangs.  There's an error in the log:  

2011-04-18 10:28:56,237 [  22581]   INFO - ains.communicator.util.XMLUtil - Error reading C:\Documents and Settings\me\.IntelliJIdea10\config\ideTalk\userModel.xml
com.thoughtworks.xstream.mapper.CannotResolveClassException: jetbrains.communicator.core.impl.users.PersistentUserModelImpl : jetbrains.communicator.core.impl.users.PersistentUserModelImpl
 at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:49)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:72)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.CGLIBMapper.realClass(CGLIBMapper.java:40)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:60)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:76)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:26)
 at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:34)
 at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:113)
 at com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.unmarshal(ReferenceByXPathMarshallingStrategy.java:29)
 at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:832)
 at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:819)
 at com.thoughtworks.xstream.XStream.fromXML(XStream.java:767)
 at jetbrains.communicator.util.XMLUtil.fromXml(XMLUtil.java:55)
 at jetbrains.communicator.core.impl.users.PersistentUserModelImpl.readAll(PersistentUserModelImpl.java:103)
 at jetbrains.communicator.core.impl.users.PersistentUserModelImpl.<init>(PersistentUserModelImpl.java:49)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
 at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:193)
 at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:220)
 at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:53)
 at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:248)
 at org.picocontainer.defaults.DecoratingComponentAdapter.getComponentInstance(DecoratingComponentAdapter.java:60)
 at org.picocontainer.defaults.CachingComponentAdapter.getComponentInstance(CachingComponentAdapter.java:58)
 at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:395)
 at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:375)
 at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)