Crashes after Level 10

I love this app, it has great appeal to youngsters. It needs a lot of work to stop the loss of work and to go onto all levels. i have not been able to ever get the total of 1000 words. Pleas fix ASAP! Kids love this app.

phdchild about Sight Words Flashcard - 1000 words for kids in preschool, pre-k, kindergarten and grade school