Apart from the "highlight op posts" not working, here's an actual bug....
On the mobile launch thread, I clicked an image someone had posted. Nothing appeared to happen, but imagine my surprise when I reached the bottom of the page, only to find the image, slightly larger, but below the" desktop site" link.
Screenshot attached.... In addition, below the image was about 5000 pixels of whitespace. If you look to the right of the advert in the screenshot, you'll see a very tiny scroll position indicator, showing just how much whitespace there is below the current position.
Nexus 4, Opera mobile 22.