This is now resolved. Element still works. From tech support:
1) Quit all applications.
2) Unplug all Tangent panels.
3) If you’re using the Element‐Vs app on a tablet then quit this.
4) Go to the Tangent folder in Applications.
5) Run the Tangent Mapper and go to the Help menu and select Reset System.
6) Quit the Tangent Mapper.
7) Run the TangentHub‐Uninstaller. This will open a terminal window which will prompt you
for your admin password. You need to enter your admin password to continue, note the
letters you type will not appear as you type them.
8) Reboot your computer.
9) In Finder got to the Go menu and select Go To Folder…
10) Enter /Library/Application Support and click Go
11) Delete the Tangent folder if it exists.
12) In Finder got to the Go menu and select Go To Folder…
13) Enter ~/Library/Application Support and click Go
14) Delete the Tangent folder if it exists.
15) Reboot your computer.
16) Now install a fresh copy of the Tangent Hub from the Tangent website.