Yes, on PC and I suspect it is a bug; Here's the sequence of events:
Meet Devella in Elfsong Tavern & update quest/show her the murder ledger. She says she's headed to protect the patriars on the list. (Save) Ok, on me to save the others...
Arrived @ the "Wine Tasting" and used successful Medicine check to detect the poison, asked Dolor to drink first. Doppelgangers attack, Dolor gets away, save Corin.
The Quest markers update and there's Figaro and "Investigate the Murders" waypoint on top of each other. Went directly to the scene and stopped the murders. Partial "First Meeting" of Devella cut scene with immediate CTD
Reload
Stop the Wine Tasting murder (don't detect the poison this time) but save Corin. Quest updates same as above, head there and CTD after winning.
Reload
Stop the Wine Tasting Murders (save), then press on to other murder victims; too late for the smuggler, the park manager, the 'appointment only' guy, but warn the woman drinking at the bar. Move on to Figaro. CTD.
I think the patch might have bugged the quest b/c every time it CTDs, it tries to play the initial Devella meeting cut scene. I saw someone on Reddit posted this happening like 10 days ago, but got no replies, so maybe patch bugged it?
I'm *more* interested in finishing the quest in order to get Lae'zel back from Orin the Red and I think this is the path to getting there.