Poof! Its Gone!

This app worked perfectly when I used it right after purchasing it. It was just what Id been needing - a way to print envelopes from my iPhone. Yesterday I went into it to print an envelope, but exited to double-check an address. Now when I tap to open it, it poofs off the screen. It is just flat gone. It wont open. Whats up with that? Im not happy at all. I would give it 4-5 stars if I could use it. As it is, I will give it 1star.

NancyG4695 about Envelope Maker