I'm toast at the moment thanks to a sickly son but if you could PM some site details and a temp admin login for your ISC I can take a peek.
Does sound a bit odd though as it seems to indicate it's completing successfully...
EDIT: Check that... I did a little googling based on your orders email and found your site
*lurks around in the underworld*
Checked the feed location and there is a feed file there so I then tried running the feed generation again and it worked but did not export a single product which makes me think that the most likely problem is one of the following:
- Products do not have a UPC field
...OR...
- Products do not have an MPN custom field (or SKU field with Add-On setting "Use Product Stock Codes (SKU) as MPN")
Note: Brand information automatically defaults to your store name if you haven't displayed it or it's not available
It would still be useful to have temporary admin access to be able to verify the above information though as it's possible something else is not quite right.. FTP info to be able to add some additional debug code into the module files to check for other issues might be necessary at some point but as a start point I hope the above is useful.
Cheers,