Freezing app

I really like this app, as it is definitely very useful at the gym. Pretty easy way of managing workouts, and very intuitive interface. The only big problem Im facing now, is that since I updated to the 3.0 firmware for the iPhone, it just freezes as soon as I open the application. I cant go anywhere on the app. I already reinstalling and keeps doing the same. Now I cant use it anymore and Im getting so frustrated!

Varelochi about iStayFit