(Checked on chrome, mac&Win10, Firefox, win10.)
Going to a post from notifications or directly (e.g., https://campuswire.com/c/G0D18B898/feed/28) shows post and answers and changes the url to https://campuswire.com/c/G0D18B898/feed. I click on an image in an answer to enlarge it, then click away from the image and I get a white browser frame. A refresh returns me to the class page https://campuswire.com/c/G0D18B898. I would prefer to return to the post+answers to continue my reading, but I have to navigate back to it.