Hey @prbrown,
Welcome to the forum! 
It has been looked at...
Troubleshooting [Keyboard Maestro Wiki]
Look specifically at macOS Issues at the bottom.
- What issue? More than one is described in this topic.
- Are you a new user?
- Did KM work before?
- Did the problem occur upon upgrading your version of macOS?
- Etcetera.
-Chris