Presenter was unable to open project file error.

Hi - I'm getting this error on all my Presenter files: 

Presenter was unable to open this project file.  Reboot your computer and try again.

I've rebooted, but still get the error. I can see one project having a corrupt .ppta file but all of them?

I'm using Articulate 360. Some files are old, some new.

Any idea on how to fix?

Thanks, Steve.

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