Here is the step to reproduce the issue:

1. Install a fresh Confluence 5.1.3 instance.
2. Create a new page.
3. Attach the xls file created with macro.
4. Add the Excel macro to display the file and also add the value spreadsheet name contain that the macro to the "Worksheet Name"
5. Try the preview in the macro or save the page.
6. The macro will load forever and we've got the following error message in the log :

   2013-09-03 13:09:03,552 ERROR [http-8513-3] [xhtml.view.macro.ViewMacroMarshaller] marshal Error rendering macro: viewxls
    -- referer: http://mymac:8513/pages/editpage.action?pageId=1507330 | url: /rest/tinymce/1/macro/preview | userName: admin
   java.lang.OutOfMemoryError: Java heap space
   	at java.util.Arrays.copyOf(Arrays.java:2734)
   	at java.util.ArrayList.ensureCapacity(ArrayList.java:167)
   	at java.util.ArrayList.add(ArrayList.java:351)
   	at com.aspose.cells.b.a.a.e.a(Unknown Source)
   	at com.aspose.cells.bG.a(Unknown Source)
   	at com.aspose.cells.bG.a(Unknown Source)
   	at com.aspose.cells.cn.a(Unknown Source)
   	at com.aspose.cells.cn.i(Unknown Source)
   	at com.aspose.cells.cn.b(Unknown Source)
   	at com.aspose.cells.cn.e(Unknown Source)
   	at com.aspose.cells.cn.a(Unknown Source)
   	at com.aspose.cells.cn.a(Unknown Source)
   	at com.aspose.cells.Chart.toImage(Unknown Source)
   	at com.benryan.conversion.SpreadsheetConverter.collectImageObjects(SpreadsheetConverter.java:283)
   	at com.benryan.conversion.SpreadsheetConverter.convert(SpreadsheetConverter.java:85)
   	at com.benryan.conversion.XlsConverter$1.doConversion(XlsConverter.java:47)
   	at com.benryan.conversion.DocConverter.execute(DocConverter.java:61)
   	at com.benryan.conversion.macro.ConverterMacro.execute(ConverterMacro.java:254)
   	at com.benryan.conversion.macro.ViewOfficeFile.execute(ViewOfficeFile.java:75)
   	at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.marshal(ViewMacroMarshaller.java:88)
   	at com.atlassian.confluence.content.render.xhtml.view.macro.ViewMacroMarshaller.marshal(ViewMacroMarshaller.java:24)
   	at com.atlassian.confluence.content.render.xhtml.DefaultXhtmlContent.convertMacroDefinitionToView(DefaultXhtmlContent.java:153)
   	at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)
   	at com.sun.proxy.$Proxy241.convertMacroDefinitionToView(Unknown Source)
   	at sun.reflect.GeneratedMethodAccessor642.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   	at java.lang.reflect.Method.invoke(Method.java:597)
   	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
   	at org.springframework.osgi.service.importer.support.internal.aop.ServiceInvoker.doInvoke(ServiceInvoker.java:58)
   

The same issue can be reproduced on Confluence 5.2.3.