Until now, quick replies were working wit images, but sudenly image_url seems to be ignored, its not working, there is always just plain text (title):

"quick_replies":[ { "content_type":"text", "title":"Red", "payload":"{POSTBACK_PAYLOAD}", "image_url":"http://example.com/img/red.png" },{ "content_type":"text", "title":"Green", "payload":"{POSTBACK_PAYLOAD}", "image_url":"http://example.com/img/green.png" } ]