I upgraded Magento 2.1.5 to 2.1.6 and after upgrade the product images in frontend's product list pages stopped working. Inspect says the following for all the products:
GET /pub/media/catalog/product/cache/f073062f50e48eb0f0998593e568d857/t/r/image.jpg 404 (Not Found)
Tried to clear and disable cache. I also re-deployed static content. Also set the owner of pub/media to be apache user.
Also worth noting that images at product pages work without a problem. The problem is at the product list page.