I installed the 1.2.1 version yesterday (fresh/empty installation). When i create a quote the customer or the admin can see the PDF file. When you click on it through the Guest URL or through the back-office side, there is an error on the left side. Normally (on the invoice) it would show the customer address. check http://www.premiumpremiums.nl/customer-address.JPG for the image.
I also installed the dutch languagepack, but i also get the error in the English language.
Hopefully it is a small issue because i really like the concept of this application.