Every so often, one of my mcbe worlds will appear with a missing texture thumbnail and it would say that the world has been currupted. I don't know this this keeps on happening so often, since I always make sure the game saves all the way when I leave, and I don't just press the close window button while in a world. I export my worlds every now and then so that it saves my world just in case it currupts; and I let the export process finish all the way. Just recently though, I couldn't get into my worlds or create new ones from the mcbe game itself, clicking "play" or "create" wouldn't do anything, and even creating a copy wouldn't work as well. I don't know why I'm having so many issues with my game. I'm playing on a monitor connected to a separate computer box, and every time I finish using the device I'll turn off the monitor and the computer box.