I used WP Admin to remove the plugins, and then installed version 4.1.2 of all three plugins. This did not work, getting the same errors.
So I did a full server account restore from 2 weeks earlier. That worked, the current versions are:
The Events Calendar PRO version 4.1.3 by Modern Tribe, Inc.(http://m.tri.be/20)
The Events Calendar: Community Events version 4.1.2 by Modern Tribe, Inc.(http://m.tri.be/21)
The Events Calendar version 4.1.4 by Modern Tribe, Inc.(http://m.tri.be/1x)
Let me know if you want to see the current System Information, and where to submit it.
Gotta get this fixed!