I think its a bug thats appears in the latest version 1.20.2
sometimes when you creating a new tweenlite.fromTo and passing some variables with onUpdateParams the variables not always passing
you can clearly seeing this by looking at the console
var test = 'test';
var t = TweenLite.fromTo(".blue", 1,{width: "1px",}, {
width: "200px",
onUpdate: testbug,
onUpdateParams: [test],
});
function testbug(x){
if(!x) console.log('bug?')
}