This is very strange. I re-downloaded AS 4.2.1.GA as well as the Seam 2.0 Beta. Ran ant in the examples/itext directory and everything compiled and deployed correctly. Same issue as above. No exceptions, no errors, it only displays the pdfMissing.xhtml page. I'm not modifying anything within the example. Has anyone seen this issue? Seems like it should work straight out of the box.
The problem was with the Safari browser. I downloaded Firefox, and it works perfectly. Not sure what's going on with Safari though.