LDraw Model Viewer and Online Tools

[Eugen]

This leads me to believe this some sort of external graphics issue and beyond my ability to fix.

You may try to test all the same apps & browsers with sandboxing them from external graphics by forcing to use software OpenGL

On Linux:

Code:

$ env LIBGL_ALWAYS_SOFTWARE=1 <program>

On Windows and Mac use appropriate Mesa3D builds and instruction.