Hope you have sorted it out,in case it was Online activation. Mine works by the book, so here is some advice how perhaps you can get it Work.

Fallowing instructions how to use it. Load you default flight, then change to a plane where you have the wx installed and then proceed...
At the Lower Left hand buttom, go thru the four steps and let it load, it might just take a minute, ( Be sure you haave some weather loaded into the flight ) You can choose actual weather or from the weather themes. I always experiment with STORMY Weather and it always gives me a nice colorful reading :D Hope these steps help.

Berlopez