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After flying for some time, X-Plane 11 stops loading the terrain. I am unsure as to the cause or solution to this issue.
The reports we've seen of this in the past tend to be on dual core machines. The work around in this case is to download & install Dataref Editor. Then open it from the plugin menu in X-Plane and pick the art controls option. When you get to the end of scenery, find the art control reno/draw_fft_water and change it from 1 to 0. Does scenery start to come in within a few minutes? Try a new flight and see if this brings in the scenery now.
If you are seeing this and your machine has more than 2 cores, please still give this a try, then send a bug report including a log and the results of this.
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