Nailed it down to this update breaking the layering:
0.108u2: Added proms ($0, 20, 100, 300 - Char layer X shift, sprite state machine, sprite Y scaling and video timing). Changed palettesize to 1024 colors.
0.109 and newer, your ship now goes behind the blue warp at the end of each sector.
Also, at some point in MAME development, it looks like the colours were changed on sprites. The barriers across the trench in sector 5 have heavy amounts of magenta in them, which the earlier versions of MAME shown above do not. I'm not sure which is correct, as I don't have footage of either running on an arcade cabinet, but the strong magenta looks a bit out-of-place compared to light blue that earlier versions of MAME had.
Edited by VirtuaIceMan (11/13/22 07:45 PM)
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Re: Buck Rogers - Planet of Zoom - the bug has been present since 0.109!
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