I have the same problem…My WP e-Commerce version is 3.8.8.5 and my Product Importer version is 3.1.8.
When I upload my CSV, nowhere in frontend is the variations dropdown. When I edit the product, the variations are there(only in administration), but after save, they are not there 🙂 My CSV file is here…please look on it http://importer.knihkupectvo-in.sk/Produkty-na-web4-pouzitelne.csv
