As an 83 year old user of Minecraft I enjoy the game but was presented with a white screen a couple of days ago. Searching could find no straight forward method for getting over this. Uninstalled it. Then went to Minecraft site and downloaded trial edition which was ok. Then decided to buy full version. It will still only allow me to use the demo edition. Have uninstalled it several time and then reloaded but no joy. Have been to the various help pages but get lost in the jargon. Can someone help please.