I have exactly the same problem discribed here. I've tried a few suggestions; namely check that my PC has enough free space. Another suggestion was to open 2016 Watchtower or Workbook, toggle through a few items there for a bit then go back to homepage, wait a little while and this might get it updating. That didn't work for me so I'm searching everywhere and asking everyone who might know.
Would so appreciate any helpful suggestion. Many thanks.