Not working on my iPod Touch

Why is this not working on my Touch? It loads fine, but any time I try to change the measure (ounces to grams, or something similar) the app quits and takes me back home. Ive sent a note to the support email but no response so far today. Im bummed and I sincerely hope that there is a fix. I will happily post another review if and when I get this running properly.

ThrowMeTheDisc about Ratio