Information below is a noise and appears even on successful rendering. Log level could be reduced to DEBUG.

2013-09-10 16:33:37,774 WARN [http-8523-3] [com.benryan.conversion.PPTSlideServlet] doGet Conversion task timed out for attachment : Panasonic_NiMH_HHR70AAAJ.pdf with page number 0, waited : 300, now executing in background.
– url: /confluence/plugins/servlet/pptslide | userName: admin.