Gmod crashes when loading map when i change the -dxlevel flag

[xdarkmario]

I am unable to change the -dxlevel for gmod, i want to put it higher so that i can apply the HD mod pack but whenever i change that flag the game launches and all video settings reset, then i set them back and try to load a map then the game crashes. it generates a crash dump file in root but it dosent seem to be readable with any editor (must be in raw format)

[Rubat]

After launching the game with -dxlevel 95, exit the game and remove it from launch option. The dxlevel setting will be saved and your video settings will go back to what they were.