Unfortunately I don't have a good save before the quest completed. I just use auto and quick saves. Since finishing the Fate of the Skaal quest started Cleaning the Stones, I went ahead and did that quest, not realizing I should have had another quest started at the same time.
And yes I am using mods. Before I go disabling all my mods and probably causing it to crash, how would a mod interfere with a quest starting?
What is a game cache verify and how do I do it?
Also, I visited Neloth and typed "setstage dlc2mq04 10" in the console, then "getstage dlc2mq04" to verify it was at stage 10. I was then able to talk to Neloth about the black books, but it didn't advance the quest. Also, the setstage command didn't add the quest to my quest log. Is there a way to add a quest to the log using console commands?