Over the past week or two I've experienced several problems using the back button on my browser to return to a previous page (often the current search page). It won't let me go back and seems to hang up when a site called t.pointroll.com is being accessed. I can return to the previous page by using my history, but this is a little annoying. It doesn't happen frequently (I use the back button quite a bit in my daily perusal of SB) but only on certain threads (no commonality I can detect).