Maybe it is something wrong with the original document. I exported one of templates and checked it in Apple Preview, Quick Look, Cover Flow (in Finder) and Adobe Reader (Build: 11.0.07.79). All text and graphics were displayed the same way as in the document.
Please try to export a template. If the problem repeats, tell me what version of OS X you have. Try to export to TIFF or JPEG. Will it be blank as well?
If only your document produces a blank PDF:
1. Make sure that the active design element has some content when you open the Export dialog.
2. Check the Print preview. Is it also blank?
3. It can help if you send your original document to email@example.com
- I'll try to export from it on my computer. Please add the link to this topic to your email.