Benito4 for IPad Locked Up

I recently purchased Benito 4 for IPad from the Ap Store. After using it for a few hours, it has locked up and I can't use it. I love the program and will get a lot of use from it, but was very disappointed that it locked up as I was creating a new form. Also, I need to see a tutorial, since there are few instructions within the program. I would appreciate any help you can give me.