Mel, I attempted to post an answer to your response last night but the system hung and I was unable to post. The two sceneries that you mention in your post are two of the sceneries that I had activated in the Seattle area. I also have the FlyTampa Seattle flattening patch installed in the area. My problem when I load a flight everything hangs on the scenery load of the flight generation phase. If I overfly the area things go black and the sim is dead. I never installed the KNUW flatten unles it was a part of the auto install of the Milatary AI Works Whidbey Island Growlers Package. My wife and I are in the process of moving from Minneapolis to Hudson Florida. The movers are coming either Monday or Tuesday to pack and load. I most likely will not be able to work on my problem now until we get resettled in Florida. Thanks Tom

Tom, The KNUW flatten and the KTCM flatten I was referring to were my own creation, not a part of any of the downloaded scenery packages. Good luck on your move to Florida, I hope everything goes smoothly for all of you,.........or should I say Y'all. In the mean time I will keep thinking on the problem. Best regards,Mel P.S. Update: I did recreate the KNUW flatten and I discovered that by changing the elevation of the flatten by 0.25m so as to be different than the airport the problem was resolved. I wish I knew why so I could claim I knew what I was doing!