I tried your suggestion, tested everything locally on my testing server (MAMP) and all is working fine. I upload the files to the live server and I have the insert/update behaviors working, but none of the file names for the new uploads are showing up.
So... I decided to scrap all the admin pages, and create a new set. Once again, created the 6 pages, went through adding DFP to the insert and upload pages, and tested them out fine in my testing server. Upload them to the live server, and the same problem - I insert a new record, browse to the document, hit the button and the results page shows that another item has been added, but there's a blank where the name should be.
Am I missing something basic here? Why does it work and show the name of the inserted item on my testing server but not on the live site?