Exporting PDF with Gliffy diagrams causing error

Running a Confluence 4.1.7 with Gliffy plugin 4.2.2

Steps to reproduce:

1. In a space, create a page with one or more Gliffy diagrams on it.
2. Export the entire space as a PDF.
3. Then, open your PDF, and you'll see a error instead of the diagram:

   Error rendering macro 'gliffy' : java.lang.ClassCastException: com.atlassian.confluence.util.ConfluenceMockServletRequest cannot be cast to
   javax.servlet.http.HttpServletRequest
   

I've attach a PDF, with the example, in the section 'testttt'.