Nick, thanks that worked. I'm totally loving ORBX scenery, it makes all the difference in the world for FSX!
I am having a few other performance related issues. One is at KLAX I see black squares all over the landscape as shown on the attached laxorbx.png file. Also, I sometimes get really slow FPS (6-10) at KLAX is the slowest I've seen. I set the Scenery setting based on the Southern California Orbx manual. I also see strange things in scenery that seem to be performance related. There are times the gauges (in a Aerosoft Twin Otter Extended) and the outside view of the plane take a long time (minutes sometimes) to repaint (gauges are blank, plane looks like it has primer but no paint). If I use the PMDG 777, performance issues are worse.
So, in general I think I have plenty of hardware/RAM, but clearly I'm seeing a number of performance issues. My first question, is with my hardware configuration, what should I expect in terms of Orbx Southern Cal performance? FPS and scenery that does not have intermittent glitches, etc? What is the best strategy to maximize Orbx scenery performance?
PS My computer is: NVIDA GeForce GTX 680, Intel i7 950 @ 3.7 GHz, RAM 24 Gig, OS: Windows 10