Registering Torsion

I've recently bought a new machine and installed Torsion on it. Every time I open the program it asks me for my registration code. The one in my account works and I'm able to use Torsion, but it seems to forget I've registered when I open it up again.

It's not too much of an issue as it does work; it just means I have to grab the code each time and put it in, which is starting to get irritating! This happened with anyone else?

Cheers.