For the Text display in some of the View Element, the _ is used for subscript.

So, B_x will be displayed as B[sub]x[/sub].

And 0 is used for numerical value for the variable.
For example: "Vx=0.0 m/s" might be displayed as "Vx=3.45 m/s" if the value of the variable is 3.45

So avoid 0 as part of displayed syntax for slider/numerical display...etc. However, it should work fine in "Combobox".

You will find java in the window/control Panel , open it and click remove cache or you can select cached applets and remove the one you want.