This mod is potentially game breaking.
I was playing through Alduin's Wall, and when I was about to enter Sky Haven temple, I noticed Delphine only got stuck in the beginning of the stairs and not carrying her torch. For some reason, whenever she's about to enter the temple, she unequips her torch and this breaks the quests because she's supposed to light up parts of the temple with her torch. I 'know' it's USSEP because I'm doing a vanilla playthrough and the only mod I have installed is USSEP for the bug fixes, and when I decided to enter the temple with USSEP activated the quest proceeded as it should.