Have you tried viewing this in different versions of Acrobat?

I am having a similar problem with importing an existing pdf and inserting text on a portion of a specific page. It displays just fine in Acrobat 6 and earlier, but the imported pages are blank in Acrobat 7, although the fonts from the imported document are embedded in the API2 created pdf. I am assuming that the problem is in the import function of PDF::API2, because, Acrobat 7 will open the template pdf just fine. I will post anything else I find.