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I have only seen this issue happen with the 3d graphing tool. I don't know if it exists in the 2d environment as well.
A summary of the issue: Sometime when I create a slider for a variable, say b, and then later use that variable in a formula, equation, or function, rather than use the value of b assigned by the slider, the applet just treats it as 0.
Here is a way to consistently recreate the issue:
- Define a function of two variables, say f(x,y)=xy.
- Make a slider, say by typing b=2.
- Now attempt to make a curve on the surface that goes in the x direction, at a y=value of b: Curve(t,b,f(t,b),t,-10,10)
- When you hit enter, the curve will use b=0, rather than b=2.
The same problem 
Perhaps it is a good idea to make the slider first, before defining the function or change the order in construction protocol?
I think there is a little bug
try
f(x,y)=x y
curve(t,b,f(t,b),t,0,4) (the curve is created being b equal to 0; wrong)
b=3 (the curve is redefined being b=3)
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