I created a stamper based on examples in the iText In Action book (section 6.3 Adding Content with a Stamper). All my example pdf files stamped properly. When trying it with actual production-type documents, it won't stamp. No error - just no stamp. Difference I found (which may be significant) is that the test documents were tagged pdf's, the production files are untagged.
Am I at a show-stopper here?