Crashing every 15 minutes! Please fix!

I am running this app on a new iMac that I bought in June 2012 and my daughter is routinely getting stuck on level 1,2 and 7. When the train is loaded correctly and all the carts are filled, it continues to ask her to select another animal. However, it is not possible to drag another animal to the any of the carts since all the carts are filled. This is very frustrating to a 4 year old kid. My daughter does not like the fact that you loose all your stickers when you return to the game after quitting? It is actually a very good phonic app when it works. Please fix and provide an update soon.

Keepitverysimpleplease about Abby – Phonics Island