Two licensees are reporting visible landscape corruption when opening their level in the editor, which goes away after various actions - opening the landscape editor or building geometry. PIE / game appear to be unaffected.
The first licensee says that the issue persists when exporting the heightmap and reimporting, and have provided their heightmap (attached).

I cannot reproduce, I'm assigning to QA to attempt to reproduce.

Licensee reports it is possibly nVidia specific, possibly a driver bug?

Steps to Reproduce

Create a new landscape importing the attached heightmap
Save the level
Reload the level

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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-13660 in the post.

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ComponentUE - LD & Modeling - Terrain - Landscape
Affects Versions4.
Target Fix4.8
Fix Commit2528096
Release Commit2533352
CreatedApr 10, 2015
ResolvedMay 12, 2015
UpdatedApr 27, 2018