The uninstall from 3d connexion doesn’t remove everything.
Check there’s nothing left in:
~/Library/Application Support/Sketchup 2017/Sketchup/Plugins/
and also the system /Library as well as the user library - note, no tilde at beginning.
/Library/Application Support/Sketchup 2017/Sketchup/Plugins/
Do a global search for ‘connexion’ or it might be ‘3dconnexion’ too