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I'm not with Laminar Research, just a fellow simmer in the UK, but when you state that the "world suddenly becomes entirely blue with no sign of land", do you mean that you're flying over nothing but ocean/sea/water?
If this is the case, it could be that you have not downloaded the relevant X-Plane 11 global scenery data files for the area that you're flying over?
There's a quick way to check this, by running the X-Plane Installer application, click on the Add or Remove Scenery button and finally click the areas on the world map to download the files that you need. Please see photo below:-
It is present at some times during the flight
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