Well, I have read where Apple recommend to iMac owners that they update their USB drivers from the original ones about 8 months ago. It seems many were having problems using any USB devices but the mouse and keyboard. Apple's USB Firmware updates available on their web sites fixed the problems. I don't know if this applies to the card you described, but i hope it provides a lead.
BTW, I have been thinking about getting a Visor Deluxe my self, so let us know how it goes.
[This message has been edited by RockLord (edited 01-30-2000).]