Hello Marque:
Thank you for your suggestion, however, it appears that the company's support for Mac is limited at best.  Although 3D Connexion's web site lists the Space Explorer as being "certified" for use in Poser or Poser Pro, their tech people have indicated that it uses the same driver as the Space Navigator and as such is no more functional on the Mac than the SN.  That means that only 2 of the 15 buttons have any function at all!  Nothing has been done to improve Mac compatibility since January 2007 when they "opened" the driver to include the Space Explorer.  So, it appears that they have no intention of supporting the Mac in any meaningful way and that the only means of making the device functional may be to employ a 3rd party program such as Controller Mate.  Admittedly, this approach is less than agreeable and should not be necessary for a device that is allegedly "certified" for use with Poser and Poser Pro.