Wizard Fire (Over Sea v2.1)
During the attract mode, once the actual gameplay starts the mist covering most of the screen is opaque instead of transparent. This seems to occur if you have a SoftFX effect on (I'm using 3xBR Rounded with the Enhanced blitter).
This can be "fixed" by enabling "RGB effects" --> no change, and then choosing "No effects" --> now the mist is transparent like it should be, but there's a problem: "No effects" disables SoftFX algorithms. Enabling 3xBR Rounded (or supposedly any SoftFX algorithm) turns the mist opaque again.
EDIT: The mist looks fine with the AdvanceMAME 2x and 3x filters, but it seems that the mist is opaque when any other filter is enabled.