Material Maker preview window freezes during loads of certain ptex files

[JRDK92]

Material Maker version: 1.6

OS/device including version: Windows

Issue description: Material Maker hard freezes The preview window when loading certain materials. For example, I loaded several materials directly from the website using the feature Load material from website. It will often get stuck and never complete loading at all. Something is wrong and it's just bugged or broken somehow, and then the preview window never works again In that single material.

Example: https://www.materialmaker.org/material?id=55

I loaded this exact material, and it would not load no matter how many times I tried. It gets stuck at 16/66, and permanently fails to render the material

[williamchange]

Try this setup, the culprit is the old crystal noise node which seemed to have some shader errors, I had the replace the old voronoi nodes(seems like they are old custom nodes) with new ones

stone_brick_wall.ptex.zip