Remember Apply
Many settings, especially typing in text fields,
do not take effect unless the Apply button is clicked. Watch for the
(modified) token on the Title Bar or Status Field of Numerics
Editor to see if you need to Apply.
When using the Color Chooser, to change the color of
initial conditions, for example, remember to apply twice: once in the Color Chooser
to fix a color, once more in Numerics Editor.