> What steps will reproduce the problem?
1. Serve any of the examples as Content-Type: application/xhtml+xml
  (Methods:
   Using apache, save the file with extension .xhtml
   Or use PHP to send a different content-type.
   )
2. View the page.
3. Profit! ...  I mean bug!

> What is the expected output? What do you see instead?
I expected to see the syntax highlighted code or at least the
non-prettified version.

Instead, I see nothing where the code should be.

> What version of the product are you using? On what operating system?

This is with the SVN revision 56.