When 2 languages are installed, switching back to English does not update all fields to English language. Fresh nop commerce 2.0 beta source, running under VS 2010, sql compact.
Detail on picture http://img64.imageshack.us/img64/8572/languageproduct.jpg
I found this on some pages: ~/Admin/Product/Edit/4 ~ /Admin/ProductAttribute/Edit/1 ~ /Admin/SpecificationAttribute/List ~ /Admin/SpecificationAttribute/Edit/1