During the playing of a media file, going back (up) to the directory caused MB to go to a blank screen (I've had several blank screen issues, but that was the one that I remember distinctly because it has happened more than once); When I was at a blank screen, I could not exit, even using the X button in Telescope. I had to go into a terminal and kill the process; For the last three days, my battery has drained after 4 hours of use; Today when this happened, I went in and did top, and it showed Python using 98% cpu, which was (obviously) what was draining the battery.