Auto-pause doesn't work and activity is always 100%

Screenshot Monitor uses system API to determine user activity level.
100% activity level means there’s some hardware or software issue (like faulty mouse) that makes system think that user types or moves mouse constantly. In this case the app will not auto-pause and users would have to stop it manually by pressing button Stop themselves. Try disconnecting the mouse for a few minutes and see how it affects time tracking. If activity level is back to normal – replace the mouse. Unfortunately, there’s not much we can do about it on our side.