I discovered a minor issue with the Nightmare Creatures package where if you started the game without a shader enabled it wouldn't correctly switch to the shader you tried to enable via the Launcher afterwards unless you used the "Use all default settings" shortcut first. Luckily this is the first time I've ever incorporated PCem shaders so this is the only game affected. I've updated the installer so any future downloads will be fixed already, but if you've already installed it you can quickly correct the problem with the below hotfix. Simply drop into the install folder, merge, and overwrite and you'll be set.