I'm on a Nook Hd Tablet and Since build 1 when pressing the home button or using invite friends I've been having texture problems making some blocks look funky and items in my inventory go black only to be fixed by shutting down the app and restarting it. Also if the screen turns of from idle touch and is turned back on I have the same problem: plus the screen happened to shift upwards cutting of the top quarter of the screen and Stretching the image. The button placements seem to oddly stay the same so trying to touch quit to title you would hit achievements instead.