This button is no longer working since I upgraded to 4.0.11
I assume you are using the demo of 4.11, have you changed the skin from slider to jump to letter?
That happens in skin BnB (800x600) which is the default when set up.
Go change the skin to BnB in "appearance setting" and then "save settings"
That is what I did and worked out for me (using and evaluating ver 4.011)
Regards.