Tested on Chrome on OS X and IE 10 on Windows 7. If I access a topic from the landing page, and I haven’t scrolled enough to trigger the loading of more topics ("/latest/more") then when I press Back in my browser I end up at the top of the page. If I do load more topics via scrolling far enough then the Back button behaves like it should from a topic page.
I thought the Back button behavior was broken for a while now because of this. I have my browser window decently small so I am usually scrolled down even when clicking on links on the first load. Was disorienting not scrolling to the proper position.