Karl, Nothing is showing up in the jive.error.log when the exception occurs. Here is the full stacktrace from tomcat:
java.lang.NullPointerException
com.jivesoftware.forum.renderer.impl.JiveRenderManager.getFilterIndex(JiveRenderManager.java:916)
com.jivesoftware.forum.renderer.impl.JiveRenderManager.getRenderFilter(JiveRenderManager.java:212)
com.jivesoftware.forum.proxy.RenderManagerProxy.getRenderFilter(RenderManagerProxy.java:98)
com.jivesoftware.forum.action.EditRenderFilter.execute(EditRenderFilter.java:133)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
com.opensymphony.xwork.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:358)
com.opensymphony.xwork.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:218)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:192)
com.jivesoftware.base.action.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:40)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:175)
com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.jivesoftware.forum.action.ForumsInterceptor.intercept(ForumsInterceptor.java:181)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.jivesoftware.base.action.interceptor.AdminAuthInterceptor.intercept(AdminAuthInterceptor.java:55)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.jivesoftware.forum.action.AdminLocaleInterceptor.intercept(AdminLocaleInterceptor.java:77)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:186)
com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:190)
com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116)
com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:225)
com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:202)
com.jivesoftware.base.action.util.JiveFilterDispatcher.doFilter(JiveFilterDispatcher.java:68)
com.jivesoftware.util.SetResponseCharacterEncodingFilter.doFilter(SetResponseCharacterEncodingFilter.java:61)
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
com.jivesoftware.base.theme.ThemeFilter.doFilter(ThemeFilter.java:51)
com.jivesoftware.base.util.webwork.JiveActionContextCleanUp.doFilter(JiveActionContextCleanUp.java:41)
com.jivesoftware.base.util.JiveCompressionFilter.doFilter(JiveCompressionFilter.java:111)
com.jivesoftware.util.SetRequestCharacterEncodingFilter.doFilter(SetRequestCharacterEncodingFilter.java:72)
com.jivesoftware.base.util.MaintenanceFilter.doFilter(MaintenanceFilter.java:83)
com.jivesoftware.forum.upgrade.UpgradeFilter.doFilter(UpgradeFilter.java:49)
com.jivesoftware.base.plugin.PluginFilter.doFilter(PluginFilter.java:56)
com.jivesoftware.base.util.ApplicationInitializedFilter.doFilter(ApplicationInitializedFilter.java:81)