I changed the name of the configuration_group_title from Google Merchant Center Feeder Configuration to Google Base Feeder Configuration.

Now it's working, I re-configured and all but 6 of the 2470 records were sent to my floors_products_en.xml file. Got 5 warnings when uploaded to Google stating missing recommended attributes. I don't know if this is a problem, but I think it's OK. Any inputs on that?

Thanks!