I don't know if it's really a bug of the program or maybe something's wrong with me

But: everytime I close Yowindow (for example while turning my computer off) and launch it again, the program looses an activation key. I mean that everytime Yowindow is launched, I have to type the key in to have ultimate edition's features. Otherwise it works only as a free edition.
First time it happend when I had installed 2.0.464 version, and again with 2.0.477 version. In earlier versions everything was ok.
Thanks for suggestions or maybe solution of the problem

Ola