Thats normal, because all Scandoublers and Flickerfixers reduce the number of colors to keep the required electronics in a small size.
There is only one fullcolor and full AGA compatible "old" standalone flickerfixer:
- CompServ AGA FlickerFixer II
Its rare, expensive, and analog (requires adjusting after warmup) and its fullsize in its slot.
(You cant use a ZIII expansion in the same slot)
The Picasso4 has a inbuild flickerfixer with 24bit .. but this couldnt help with a cv64.
And there are two "new" flickerfixers with full color / AGA support:
- Indivision AGA MK 1
- Indivision AGA MK 2
They are both "digital" and dont need a slot (plugged on the chipset).
If you own a old cv64 (non 3d) you can connect the indivision output with the cv64 for automatic monitor switching.
With a cv64/3d you need some extra electronics ...
http://www.amiga.org/gallery/index.php?n=3331