Articulate Ribbon failed after update

I got a prompt to update Studio 13 when I opened an Engage file; I have seen this before but did not do it for fear of disruption.

Against my better judgement, I decided to do the update this time in the hope that it might eliminate some other problems we are experiencing.

The update went OK, usual stuff about re-entering serial number etc (why??!!), until I re-opened the Presenter file that I was working on.  The Articulate ribbon appears, but none of the functions will respond. When I click on one, the little ring flashes for 1/2 a second and that's all.

Any ideas? 

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