Did a new version of discourse get installed?
All of the sudden I'm seeing a pop up lower frame which contains post summaries while scrolling. The rendering on iOS devices at least makes the site more difficult to navigate. On a larger iPad screen it is survivable but on a phone the current post summary pane isn't going away which makes it nearly impossible to read the posts because the summary lacks pictures and embedded content and almost completely obscures main content.
This may be a setting I tripped - if so I'd love to know how to get back to the previous behavior.