[article] HL2DM Hammer Configuration Issue

This is a discussion topic for the article "HL2DM Hammer Configuration Issue" by The SnarkPit which can be found here

Article description:

Attempting to operate the Source SDK Hammer Level Editor in the Source 2006 engine for Half-Life 2 Deathmatch currently results in an error of: "Missing material, ...verify that your game directory is correct." If you have this problem, read on!

This is a Source SDK bug caused by Valve and this is a work-around to fix the issue and operate the game in the Source 2009 version of the engine.