I took 3 screenshots. One was different. Two of them are the same. One came out differently, but if I took another screenshot, which is different, the previous screenshot I took came out to be the same.
Different Screenshot:
(http://s5.postimg.org/xzytjrumv/Brawlbox_Screencap0.png)
Another Different Screenshot That Came Out to Be the Same:
(http://s5.postimg.org/egu8aevvb/Brawlbox_Screencap1.png)
I used Brawlbox v0.73b.
Remember, you can always manually take a screenshot via the "PrintScreen" button, pasting into MS Paint, cropping the borders of BrawlBox off, and then using the color fill tool to make the background whatever color for the background you want.