Images are not shown in the imagefield when editing the product variation

The images are shown in the table nicely, but after clicking edit, the imagefield contains no images.

This can be seen in:
http://drupal.org/files/Screen%20Shot%202013-01-22%20at%2011.12.04%20AM.png

The reason for this is that IEF is now calling the field attach form with the proper language code.
However, the demo store products have no language code assigned ($product->language) is empty, which confuses the language fallback.
The solution is to set LANGUAGE_NONE as the language to each product during product creation.