Anyone having problems updating to Sierra PB4? Running a late 2013 rMBP, currently on Sierra PB3 (build 16A270f). No problems with PB3, but the updater in the App Store does absolutely nothing. One update is showing, but clicking the update buttons does... nothing. I get the "Some updates need to finish downloading before they are installed" dialog box, but there is no progress bar. The Apple menu shows the "one update" lozenge next to the App Store... item. Restarting makes no difference. I kinda don't want to be stuck on PB3!