As I said in the tweet, I'm not sure why it's there but it doesn't affect the program area. I've passed it along to the engineers for inspection.
Already twittered pulse the images and such Android APP issues.
So yeah , there's a black bar ontop of the screen which turns black and could be used to fullscreen rekordbox Android.
Phone : Samsung Galaxy S Plus GT-I9001 , Android 2.3.6 , SUPER-AMOLED 1280x800 screen.