For the last couple of days, I noticed that smilies don’t seem to be displaying. Where you would expect to see one, you instead see the tag (which is draggable, like an image, with the accompanying right-click menu, but can’t be selected like text, even though that’s how it’s displayed).
For example: 
:smile: :wink: :smile_cat: :stuck_out_tongue:
The horizontal rules that separate posts seem to have disappeared from the mobile view as well.