sorry by disturb forum. But my experience show that is ok my position too.

    I attach screenshot from another production store (4 years online. same items) ver 1.9.1 without child images and work fine the mini cart and shopping cart. If every child of a configurable product include the same image of parent then media folder would be too long.

    I check this issue with fresh magento 1.9.2 demo installation and work as i show. If work fine in another stores, why do not work with quickstart Avaz package?

    Please see the pictures.

    1. child1.jpg

    2. chiled2.jpg

    3. minicart.jpg

    4. cart1.jpg