Minecraft won't open

I updated to 15.3 on LG VK815 and now MCPE won't open - get message "Unfortunately Minecraft PE has stopped working". I have uninstalled/resinstalled several times. Have clicked bug report several times w/no response. At the very least I would like an update/response otherwise I won't my money back as this is unacceptable. My son cannot play and lost all his worlds.