OK. I couldn't get any love for my BUG or FEATURE post last week, so I hunted down a bug that is perhaps related. 
When I come across articles which span two columns (as highlighted in screen shot below), the article area is a "side swipe" no-mans land. If I try to advance the page forwards or back by swiping over the area shown in red, nothing happens… I have to move the cursor to another area of the page. This was true of every two column article.
