Blank "add products" screen - NO DEBUGGING ERROR MSGS

Hi!

I just started working with ZenCart version 3.9.1f

My ISP, Go Daddy installed ZenCart for me. I did rename the admin folder as recommended - other than that, I have not touched the site.

When I try to add a new product - any new product of any type - I get a blank page.

All of the other admin functions seem to work. I've tried re-uploading the admin files to the renamed folder but it didn't fix it.

I have debugging turned on but it's not creating any debug files showing any PHP errors.

More info:

URL of the page that is blank:
****/product.php?x=71&y=11&product_type=1&cPath=&action=new_product

(**** = path to admin folder)

I've verified that:

1. the file product.php exists and is 24K.
2. it doesn't appear to be corrupted in any way - i can see it in my PHP editor just fine (but closed w/o saving).
3. I have the same errors for the other product handler files (product_free_shipping.php, product_music.php)

Fixed this by downloading the latest 1.3.9f files from the Zencart web site and re-uploading the admin files to my admin folder. . .t