Trouble with Full Screen Movies

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I have the movies working correctly on Blitz3D in windowed mode, but I can see just a black screen in Full Screen Mode.
Anyone knows why?

Here's my simple PlayMovie function:

Function PlayMovie(movieName$)

ClsColor 0,0,0
SetBuffer(BackBuffer())

movie = OpenMovie(movieName$)
If movie = 0 Then RuntimeError movieName$ + " not found!"
If Not(MoviePlaying(movie)) Then RuntimeError "Error - Movie not playing!"

While (MoviePlaying(movie)) > 0 And (Not KeyHit(1))
Cls()
DrawMovie(movie, 0, 0, 640, 480)
Flip()
Wend

CloseMovie(movie)

End Function