this issue still exists in out of the box 5.7. with the default environment lighting setup you get glowing or super reflective metahuman grooms. none of the above worked for me - the only way i’ve found to fix it is to increase the melanin to .95-1.0 for every material for each groom in the scene. not ideal and not sure how to fix once we’re out of previs stage. may have to skip environment lighting altogether and use massive spotlights/directionals or something? this has been an issue with metahumans since introduction - how have we not receive official guidance from the metahuman team?