You open a PDF diagram generated by iteraplan and see no content at all.
When using Microsoft Windows and the PDF Reader provided from Adobe, it may sometimes happen that a generated PDF diagram seems to be empty. This is because the generated diagram is larger than the page size supported by Acrobat Reader (approximately 5 meters). Using a different PDF reader, for example the Foxit Reader, should allow the user to see the contents of the diagram. For Mac OS and Ubuntu Linux the built-in PDF readers are known to have no problems with large diagrams.