I hope you all can help me.
Yesterday, I had a switch in this same location that "chattered" ONLY when I connected a lighted RealTrax Bumper or placed cars anywhere on the spur far down from the straight part of the switch. The turnout part was fine.
So I replaced the switch with a brand new one, straight out of the box.
However, although it does not chatter, it refuse to throw from its present position, and instead makes a humming noise and feels like pressure on the toggle handle, and it goes right back to where it was.
If I disconnect the track leading from it, then it works fine.
Take a look at the pictures of offending switch I have circled in red, that also shows the disconnect tracks that allow it to work.
Keep in mind, as you will see in the pictures, is that there is a downward slope before the 2nd switch.