When Opening Scene there is a startup script error.
Anvil embeds reference to a script in your 3ds Max scripts folder. If that file is missing, there can be an error.
Anvil embeds some scripts for scene startup to protect displacements from being invalidated via improper manipulation. Older versions of Anvil referenced a file that could cause an error if missing.
Converting Displacements to Models
Steps on converting a collection of displacements to props.
OSL: Radial Gradient

Simple Radial Gradient OSL map for 3d Max included in Wall Worm.
Troubleshooting
Articles to help troubleshoot problems with Wall Worm, 3ds Max and/or the Source Game Engine.
Displacement Proxies
Displacement Proxies allow teams to work more efficiently with displacements in multiple files.
Texturing World Geometry in 3ds Max
Basic tips on texturing world geometry in Max, especially for those with a Hammer background.
Arch Primitive

The Arch Primitive is a scripted geometry plugin for 3ds Max that creates arches for world geometry in BSP games such as those made on the Source Engine
Displacement Texture Scale Sometimes Incorrect
Understanding Displacement Blend Texture Scale
This page explains one cause for displacement materials to be scaled incorrectly in Source as well as the solution. You should use bitmaps of equal dimensions in both materials controlling the Blend material.