office 2016 activation problem

I am having trouble getting all components of Office 2016 activated, running under Yosemite. Word and Excel have been activated, but PowerPoint still thinks it is running under the "preview" option (30 days to test the software). When I click on the "Activate" button in the dialog that appears on PP startup, it does not go to the actual activate sequence, but acts as if it is already activated. In fact, the "Activate Office" menu item under the PP menu is gone. I'm concerned that I am gong to reach the end of the 30 day window, and the problem will lock up on me. It seems like a flag as been set in the app and was not reset when I did activate my license for Office 2016.

Any insights/suggestions would be appreciated. I heard from a friend today that El Capitan has an update that fixes a bug with Office 2016, but am not sure this is dealing with the same problem.

Mike Phelps