Baron wrote:
> For the past few days I have been getting a "Session locked by user"
> message with only user can unlock this session.

That could be the screensaver (TCC > appearance > screen saver).

"Below that is a check box labeled Require password to stop screen
saver. If it is checked, when you click a key or click a mouse button
to end the screen saver and return to your work, you must enter a
password."