I take it you actually have a FlickerMagic as ScanMagic boards traditionally don't do de-interlacing (flicker fixing)?
Shame because its a brilliant SD/FF
It was pretty good when it came out but it has been surpassed these days by the Indivision AGA 4000 (and a few others).
Scan/Flicker Magic boards are not 24-bit so you loose colours in AGA modes and they doen't work (in PAL mode) with half the LCD's out there because the refresh rate is fixed at 50Hz and most LCD's have a minimum refresh of 56Hz