Andy is GREAT at tech support. Give him a quick email.
After I blew up my opti-pac (plugged positive 5volts to ground and vis-versa... btw, NEVER plug it in until you have really figured out where you got your power from : ))
He sent me a replacement chip and some resisters for FREE!
IE, hes GREAT!
But also consider the MK64! Great card! That is the only one I have personal experience with and again, its a WINNER!