Nikon has posted a warning to users of it’s various imaging software, including Capture NX and Nikon Scan that Mac users should not upgrade at this point to Snow Leopard, Macintosh’s latest version of OS 10
The problems are unspecified on the Nikon site, simply warning of incompatibilities.
I have not yet upgraded to Snow Leopard but will keep you informed as developments become available. To read the Nikon statement click here, http://support.nikontech.com/app/answers/detail/a_id/16522