The more I learn about photography the more I've been playing around with lights lately in poser.  But I've run into a problem where I can only add a certain number of lights before they just don't "work" any more.  I can add more, but they don't light anything in the render or preview.  It looks like the limit is 8.  It does not seem to matter if they lights are turned on or off.

Is this something other people have run into as well?  Or is this maybe something odd with my graphics card?  I'm running P7 under Windows 7 (but also ran into this running in Vista).  I can't find anything on this on the SM support site.