Code: http://hastebin.com/yawulosevi.java

 

The button is drawn as this:

 

The problem is is that your button is too "tall". It cannot be more than 20px high or it starts drawing other parts of the gui on it.

 

public class GuiAmmoSatchel extends GuiScreen {
public GuiAmmoSatchel() {
}
@Override
public void initGui() {
	super.initGui();
	this.buttonList.add(new GuiButton(0, 96, 96, 96, 20, "Testing 1.2.3.")); // this is the line that I changed
}
@Override
public void drawScreen(int x, int y, float f) {
	drawDefaultBackground();
	super.drawScreen(x, y, f);
}
}

 

Another way you could do the button is like this:

this.buttonList.add(new GuiButton(0, 96, 96, "Testing 1.2.3."));

 

That automagically makes a width. The height is set to 20 automagically aswell.

 

Hope that helped

It did, thank you.

 

What would it take to make a button taller than 20px?

you need to create your own class Check the buttons in the Book and Quil