I encountered a glitch early on in the game (and did not realize it) where shortly after finishing "Loud and Clear", Brynjolf told me to go talk to Marven Black Briar but did not give me a quest to do so. I kind of got distracted and went and finished the Dark Brotherhood questline, not even realizing anything was wrong. Now, I do NOT have the quest called "Dampened Spirits", and neither Brynjolf nor Marven Black Briar will talk to me.
I have heard I'm not the first person to have this glitch, but I am curious as to if Bethesda plans to do anything about it (I was hoping it would be fixed in this patch).