hi..
Perhaps overtly simple but I have found going into the user pref Library and trashing the Nikon prefs will sometimes do the trick. You will of course need to re-establish your pref settings after.
Another small thing is the updater to the Nikon software - 4.0.2 I believe.
Hope that is helpful, good luck to you sir..
Sean, no harm trying stuff, but I don't expect it will work. That up-date is from 2004. It supports Mac System 9 and System 10 up to 4.11. It does not even support 10.5, therefore hardly likely it will work with 10.6.x.
Copy-Pasted from the Nikon website, here is the relevant information:
<<Can I use my Nikon Scanner with Windows 7, Leopard, Snow Leopard, or a 64-bit operating system?
The use of Nikon Scan software with Windows 7 (any version), or Mac OS 10.5.x or later, or any 64- bit operating system (including 64-bit, 32-bit or Compatibility mode) is not supported. We suggest trying a third party software option such as Vuescan from Hamrick.com or Silverfast software.>>