If the invoice report type is setted to "pdf",  the customer name is not visible in the address section (please see first link below)

Instead if I change report type to html, the customer address is complete and  including name (second screenshot)

Here are the screenshots : 

- http://www.awesomescreenshot.com/image/1460219/c26fe896a0863d033b65180a435de54c

- http://www.awesomescreenshot.com/image/1460234/7cb123bba7cf779e1cc82e8c12a148dc

Can you tell me how can I debug this issue?

thanks