

Load order shouldn't matter, but try loading GShadow last if it doesn't work. The universal version is compatible with mods that use the same editor numbers for their replaced decorations as the original (in basic terms, it's compatible with any mod that works with regular Doom maps), but there's no restrictions in terms of monsters (except monsters with larger radius/height than a pinky don't cast shadows, which is intentional). Only exception i know of is DUBG, if you enable Dehacked Compatibility, and possibly MetaDoom, but not sure if it's mod detection only detects DEHACKED patches.


The non-universal version is not compatible with all gameplay mods, only those that leave monsters and decorations intact.
