The export as PDF fails if a page contains ndashes (-- in the wiki syntax). I assume the same is true for mdashes (---). The following message is displayed after the "Export" button is clicked:

The following error(s) occurred:
com.atlassian.confluence.importexport.ImportExportException: com.atlassian.confluence.importexport.ImportExportException: com.atlassian.confluence.renderer.WikiRenderException: javax.xml.transform.TransformerException: org.xml.sax.SAXParseException: The entity "ndash" was referenced, but not declared. at com.atlassian.confluence.importexport.impl.PdfExporter.prepareExportXSLFo(PdfExporter.java:272) at com.atlassian.confluence.importexport.impl.PdfExporter.doExportEntity(PdfExporter.java:166) at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.exportPage(AbstractRendererExporterImpl.java:143) at com.atlassian.confluence.importexport.impl.AbstractRendererExporterImpl.doExport(AbstractRendererExporterImpl.java:109) at com.atlassian.confluence.importexport.impl.PdfExporter.doExport(PdfExporter.java:84) at com.atlassian.confluence.importexport.DefaultImportExportManager.exportAs(DefaultImportExportManager.java:75) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.springframework.aop.framework.AopProxyUtils.invokeJoinpointUsingReflection(AopProxyUtils.java:59) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:201) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:176) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:153) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:196) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:135) at $Proxy21.exportAs(Unknown Source) at com.atlassian.confluence.importexport.actions.ExportPageAction.execute(ExportPageAction.java:74) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:173) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:58) at com.atlassian.confluence.core.ConfluenceWorkflowInterceptor.intercept(ConfluenceWorkflowInterceptor.java:32) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.atlassian.confluence.core.ConfluenceValidationInterceptor.intercept(ConfluenceValidationInterceptor.java:18) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.atlassian.confluence.security.actions.PermissionCheckInterceptor.intercept(PermissionCheckInterceptor.java:40) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:37) at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:170) at com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:116) at com.opensymphony.webwork.dispatcher.ServletDispatcher.serviceAction(ServletDispatcher.java:182) at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:162) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:129) at com.atlassian.confluence.util.profiling.ProfilingPageFilter.parsePage(ProfilingPageFilter.java:36) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:61) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.seraph.filter.SecurityFilter.doFilter(SecurityFilter.java:161) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.seraph.filter.LoginFilter.doFilter(LoginFilter.java:181) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.johnson.filters.JohnsonFilter.doFilter(JohnsonFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at org.springframework.orm.hibernate.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:83) at com.atlassian.confluence.setup.SpringSessionInViewFilter.doFilterInternal(SpringSessionInViewFilter.java:32) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:39) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.util.profiling.filters.ProfilingFilter.doFilter(ProfilingFilter.java:132) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at com.atlassian.core.filters.AbstractEncodingFilter.doFilter(AbstractEncodingFilter.java:38) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2416) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223) at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:263) at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:360) at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:604) at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:562) at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:679) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619) at java.lang.Thread.run(Thread.java:534) Caused by: com.atlassian.confluence.importexport.ImportExportException: com.atlassian.confluence.renderer.WikiRenderException: javax.xml.transform.TransformerException: org.xml.sax.SAXParseException: The entity "ndash" was referenced, but not declared. at com.atlassian.confluence.importexport.impl.PdfExporter.convertWikiToXslFo(PdfExporter.java:156) at com.atlassian.confluence.importexport.impl.PdfExporter.prepareExportTemplate(PdfExporter.java:137) at com.atlassian.confluence.importexport.impl.PdfExporter.prepareExportXSLFo(PdfExporter.java:268) ... 98 more Caused by: com.atlassian.confluence.renderer.WikiRenderException: javax.xml.transform.TransformerException: org.xml.sax.SAXParseException: The entity "ndash" was referenced, but not declared. at com.atlassian.confluence.importexport.impl.WikiExporter.convertXHtmlToXslFo(WikiExporter.java:129) at com.atlassian.confluence.importexport.impl.WikiExporter.exportWikiToXslFo(WikiExporter.java:82) at com.atlassian.confluence.importexport.impl.PdfExporter.convertWikiToXslFo(PdfExporter.java:152) ... 100 more Caused by: javax.xml.transform.TransformerException: org.xml.sax.SAXParseException: The entity "ndash" was referenced, but not declared. at com.icl.saxon.om.Builder.build(Builder.java:273) at com.icl.saxon.Controller.transform(Controller.java:936) at com.atlassian.confluence.importexport.impl.WikiExporter.convertXHtmlToXslFo(WikiExporter.java:106) ... 102 more Caused by: org.xml.sax.SAXParseException: The entity "ndash" was referenced, but not declared. at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at com.icl.saxon.om.Builder.build(Builder.java:265) ... 104 more