Making buttons appear in scenes

[DBurks2818]

##slider,pos,orientation
music = viz.addSlider(viz.scene4) #Add a slider.
music.set(1.0)
music.setPosition(.669,.488) #Set its position.
music.setScale(1,1)
music.ticksize(1,1) #Increase the size.

This is what's causing the error, or any time I try to implement any slider at all. When I do, it will either show a 'broken window' where I can only see the title bar and the actual window will be transparent (and I can see the code environment through it), or the window/game will freeze when I put the slider in a different scene in the window and try to switch to that scene.

I just tried to implement a slider on another computer and it works fine, and the slider is the only problem on this one. I wonder what the problem is exactly?