Game freezes on “loading” screen in “Next to Godliness” quest

Game freezes with forever “loading” screen in “Next to Godliness” quest.
The first freeze is when you get into the tub with Capon. But I can proceed the quest without geting into the tub.
However the same freeze occurs after I come back with roses, beat some poor guy and Capon proposed to drink more wine. So it’s impossible to finish the quest.
bug appears in versions 1.3.4 and 1.4.1. I used save from 1.3.4 version (before taking the quest).