Thomas, I have duplicated what you are seeing. I opened a DGN file with a black background. I created circles and blocks and made 2 of the circles white and made the other ones to be red and blue. I changed the background from black to white and attached a raster image so the Merge command would work. The white circles changed from white to black when I changed the background color. I used the Merge command with it set to Vector Only and when the raster image was created it did not create the white circles. I will file a defect for the issue.
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