Table sorting doesn't work for the product variations view

I:
- go to .../admin/commerce/products
- click "quick edit" on the screen: a list of products is shown (see also http://drupal.org/node/1935014)
- click on the gear of the attached view and then on "edit view"
- update the view and then click "SAVE"

View is saved, but I get redirected to page .../commerce_backoffice/variations/1: it's a text only page (no HTML) with a JSON in it. I have to manually get back on the view I was editing. Is it a known problem?

Same problem if attached view as sortable columns: clicking one of them leads to something like http://www.example.com/#overlay=commerce_backoffice/variations/1%3Forder%3Dcommerce_stock%26sort%3Ddesc and immediately to http://www.example.com/commerce_backoffice/variations/1?order=commerce_stock&sort=desc& with the "JSON page".