The latest Terrain Builder version 1.31.0.162057 crashes when generating the Surface Mask on my 30720 x 30720 terrain.

The exact same project, Mapframe and Surface Mask work perfectly when using an older Terrain Builder version from December 2025.

Clear comparison:

• December 2025 Terrain Builder + 30720 x 30720 Mapframe → WORKS

• Latest Terrain Builder 1.31.0.162057 + 30720 x 30720 Mapframe → CRASHES

• Latest Terrain Builder + smaller Mapframe → WORKS
  

The new Terrain Builder starts generating the Surface Mask but crashes after approximately 1–10 seconds.

I also tested both 512 and 1024 tile sizes and a completely single-color Surface Mask. The latest Terrain Builder still crashes.

Windows Event Viewer reports:

Faulting module: ntdll.dll
Exception code: 0xc0000374
Fault offset: 0x000fcdef

The project and Mapframe have been working correctly for approximately 1–2 years. Switching back to the December 2025 Terrain Builder immediately fixes the issue.

System: Windows 11, 64 GB RAM, 128+ GB free disk space.

• Open a 30720 x 30720 terrain project in Terrain Builder 1.31.0.162057.

• Select the Mapframe.

• Go to Processing → Generate Surface Mask.

• Start Surface Mask generation.

• Terrain Builder starts processing.

• After approximately 1–10 seconds, Terrain Builder crashes.

• Open the exact same project using the December 2025 Terrain Builder.

• Generate the Surface Mask again.

• Surface Mask generation completes successfully.

The latest Terrain Builder should generate the Surface Mask successfully on the 30720 x 30720 Mapframe, as the December 2025 version does with the exact same project, Mapframe and Surface Mask.