I was talking to Victoria in the Mayors library. After ending the conversation I went down the stairs and then the dialog windwow popped up again. There is no option to end the (non existant) conversation. At the bottom of the scrolling area is the usual "I will go now" option but it is not klickable.
Only way out was to load a previous savegame.
The other thing was that I stole about 70 Gold out of a chest in the mayors house. This didn't stack with my other gold, not even manually. After loading the game, this stack of gold was gone.
I stole more gold (can't help it) and got this problem again. Now i have three stacks of gold. Two which actually say "Gold" but don't stack and one with has only the Icon of gold, see pic below. None of them stack. Although it adds correctly in the total gold amount.