Macro isn't rendering, looking in the logs I see:
2013-03-28 10:47:05,834 WARN [TP-Processor7] [plugins.numberedheadings.xhtml.NumberedHeadingsMacro] execute The Numbered Headings plugin threw an unexpected exception... -- url: /rest/tinymce/1/macro/preview | userName: VBEDN | referer: http://confluence.vt.ch/pages/editblogpost.action?pageId=36601949 java.lang.ArrayIndexOutOfBoundsException
Error occurs in preview as well as when rendering the page or blog post finally.
Thanks for looking into it. Cheers, Philipp