cant open My world - running on android 4.4.2.

hi. I am running on android kit kat 4.4.2. As many of the forums I have read there has been no help with the solution. My daughters new tablet (as broke her old one) cannot open a new world. Can access through multi player her brothers. I have read so many forums and still cant get it too work. Can you please help sort this. Shes pretty upset her brother can still play it on his.