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Hello - I am still working on a chess game. It's coming along nicely, with one exception: the GUI. I've had some trouble with loading the images from files but got that to work, but now run into this problem:

As you can see, the grid is not being drawn correctly. Here is the code from the draw() method of the scene:

def draw(self):
    background(0, 0, 0)
    fill(1, 1, 1)
    # this loop displays the pieces (works fine)
    for piece in self.game.board.pieces:
        tint(1, 1, 1, 0.5)
        pos = piece.coord.as_screen()
        img = self.img_names[piece.pythonista_gui_imgname]
        image(img, pos.x, pos.y, scale_factor, scale_factor)
        tint(1, 1, 1, 1)

    # this loop displays the grid (doesn't work)
    for tile in self.game.board.tiles:

        # this returns either (0.27462, 0.26326, 0.27367) if the piece is white
        # or (0.86174, 0.85795, 0.85417) if the piece is black
        color = tile.color.tilecolor
        color += (0.3,)  # alpha value

        # get the position of the tile in screen coords
        # this method DOES function correctly as shown by the above `for piece in pieces` loop
        pos = tile.coord.as_screen()

        # draw
        fill(*color)
        rect(scale_factor, scale_factor, pos.x, pos.y)
        fill(1, 1, 1)

I think the problem is either in the fill() or rect() function, but I'm not sure which. Any ideas?

It looks like you're using pos.x and pos.y as width and height of the rect. I think the order of parameters should be:

rect(pos.x, pos.y, scale_factor, scale_factor)

That was indeed the issue. Thank you!