Hi Eco
have you read this?
"Operation of the CyberVision64/3D in Amigas with Zorro-II bus
interface (A2000 etc.), which are equipped with a 68030 CPU or
68040 CPU, require the installation of Enforcer, which is
available on AmiNet." . . .don't ask me why!
Then . . have you tryed to disable MapRom?
Have you forced the CV643D in ZorroII mode?
AFAIK even the order on which the boards are inserted, is important in some Zorro backplane.
Ciao