Variables & Functions in Comsol 4.1

Hi,

I am trying to do something very simple that worked perfectly in 3.5a, but that I cannot reproduce in 4.1. I have the feeling that I am totally missing something, but I do not know what.

I define a global variable, myVar, and want to use it in a global function, myFun. The function myFun does not recognize the variable myVar (when plotting the function). Why???
Next, I want to use this function (which is a function of time) to define a boundary load (Model 1>Solid Mechanics>Boundary load 1). But the function is not recognized (it stays orange). Why???

I have put the example as attachment.

Thanks for any help.

Alois Pfenniger