I too have had to click on Live Traffic above the WF Traffic window to advance the traffic after the update. Its not populating! Even when your watching it, its not working. Leaving the window has nothing to do with it. I am on the traffic windows for hours and the traffic just stops on two different sites.
I also deleted the site cache on both sites and its still not working on either. I thought there was no traffic but it had stopped populating for 50 minutes.