I did everything in order by wikia sits, got dagger, red pot, and thread in window, investigated dog gate, grabbed other 6 silver items, didn't the printing with flour fly, and fly paper, found it was Carol, talked to poison salesman, asked Carol why she bought, checked drain, talked guard. Nothing works. I repeated the process even backtracked few hours. He just keeps saying I still haven't found who did do it when a prompt to click who did should be appearing. When I repeat printing it says ' you have already found the culprit'. Mod Sil assisted me for quite some time and he confirmed it bugged on my end. Even if I complete remaining quests I'm only at 106 qp, one shy from beginning legends. I only have digsite left and for murder mystery to work for me and then I can start legends.