Although I don't use SB for prodigy on a regaular basis, I did one time try do see if I could build a system faster in system builder than in Simpl, VT pro. I ran into the exact same problem your having. I didn't give it much thought at the time because I use Simpl anyway. Actually that just confirmed my thoughts on not using SB.

I hope you get your problem figured out, but my advice to you would be to bite the Simpl bullet and develope a duplicatable prodigy system to minimize programming time on later systems. Prodigy is actually very powerfull under Simpl with limited Crestron gear, but with the new Mobile pro G on an ipad you can create some great systems.

If you have not yet taken the essentials class I highly recommend you take one to get started and then as soon as your able to, get yourself in the intermediate class. At that time you will never want to open SB ever again.