It does look like trees are the problem. I have now noticed that I have the same problem with the recent Renton scenery. Am I missing something.? I have tried the above test and the problem is still there. What next? I know, MS2020, Ah hang on ! you are going to need a space age computer to run it. Just like Fs 2004 and FSX back in the day. My mate in the computer shop seems to think the very latest Intel I7 will struggle. We will see. Now back to trees1