I had this problem too. Deactivated almost all my mods except Ciaran face textures, Shantia's eyebrows, improved lashes, Those eyes and Dorian's outfit as Skyhold pajamas(also Skyhold attire pattern is good too), merged and it worked.So incoronation Day with my modded Inquisitor(pj,eyes,skin eyebrow and eyelash) I don't know exactly what mod is responsible for the White screen after the talk with Solas... the mods I deactivated are Cullen and Blackwall aestethic mods, plus halamshiral outfit modded(don't remember which) no dirt buildop ,ll crafting material fixes and bi cullen. Also I don't use hair mods. I hope this helps. ;)
