http://bugs.winehq.org/show_bug.cgi?id=57458
--- Comment #1 from Miliardo agarplayerarlon@gmail.com --- this has been indirectly fixed in the latest WINE versions, now the FL Studio startup logo appears in the center of the monitor (at leasn when you only have 1 monitor) and the background is no longer black but transparent as it should be.
Although the animation of the FL Studio logo is not as smooth as when using xwayland