All of a sudden the Business Rivals quest seems to be broken. I talked to Grog then to Marg, went back to kill Grog but there is no option to tell Marg about his rival's death. I don't even get a real dialog with him anymore. All he says is "go on and appreciate the fine tinkle of water beneath..." and I can only end the dialog. He doesn't even ask for a toll and I can cross the bridge without ever being addressed. And the quest is still open.
This worked just fine a week ago.