From Nec's site.
"At this time (as of Mac OS 10.4.10) the following Apple Macs are not compatible with SpectraView due to issues with the video chipsets and drivers:
Intel based Macs using Intel graphics processors:
Intel Mac mini
13" MacBook
17" iMac with Intel GMA 950 graphics processor
Second generation MacBook Pro 15" and 17" that have NVIDIA GeForce 8600M GT graphics chipsets.
NEC is working with Apple to resolve these issues and it is hoped that they will be fixed by Apple with a future Mac OS update."
Ken