Twitter Cards from my blog do not show images no matter what I do. I have tried small 128x128 px images and larger 400 px ones. I have specified Summary Cards or Summary Large Image Cards. All I get is the text summary. Please help.
Your robots.txt prevents Twitter to get files in /img/. You need to add a rule in it to allow Twitterbot to get those files. More details here: https://dev.twitter.com/docs/cards/getting-started#crawling
