I have created a new forum called Richard's Blog on which I intend to make occasional postings on CodeRunner issues that I think might be of interest to authors. To set the ball rolling I've made my first posting to it: an article explaining how it is possible to display student-generated images, such as Matplotlib graphs, in the feedback. Check out the posting, here.
If you wish to see more such postings, please subscribe to that forum. The more subscribers I have, the more likely I am to blog.