I had two problems; one I couldn't figure out if it was to mark it good or better. Two I tried to mark it as Adult and the box wouldn't check. The only real problem anyone will have proofing it is some of the words are Portuguese. I double checked the spelling, but I don't have the odd letters on my computer. I have the book and will keep it. If someone needs me to send them the scan of the words as they appear I can do that.