It seems that DynDOLOD is causing certain Dawngaurd interiors like Forebear's Holdout and the secret room underneath the moondial at Castle Volkihar (to enter the Soul Cairn). How did I figure this out? By the old fashioned trial and error. I completely deleted my Skyrim installation and reinstalled it. I reinstalled and activated all mods one by one, entering the troubled areas after installing two mods at a time. So far I have installed all 72 of the mods I have in NMM, some of which include: SMIM, SFO, Skyrim HD, Realistic Water Two, Better Dynamic Snow, and Lanterns of Skyrim. I'm able to enter these two areas now where previously the game would instantly CTD once I tried to go into them. All I have left to reinstall is DynDOLOD, but I'm 99.9% sure at this point it's the culprit of my CTD issues. I don't know why, so I'm here hoping to get some answers and some possible solutions. Here's my loadorder sorted with LOOT: