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.