Quote - select hair item(s) and uncheck "visible in raytracing".  FFRender/IDL is gonna calculate trans/refract wrong anyway, hence disable it for now.

Been fighting a test render for hours using Danae's Rio, Zachrael's Maroon Hair & Corvas' Soft Lights.  Either the render stopped or the hair looked awful.  Switching off 'Visible in Raytracing' did the trick.  Thanks so much Miss Nancy.

Best Wishes, All,
Rªnce