Wykletypl: So I finally began playing the game in original Polish version. I got to that moment when the hero meets Princess Sheila, I start talking to her, I select 'Dobre, że lustra nie pękają' and... nothing happens. Sheila doesn't respond to me. And I can't select a different dialogue option, because the hero just replies 'Nie mam jej nic do powiedzenia'.

I believe this requires fixing. Because if this happened to a random dialogue selection, then it probably won't work with the one that will move the plot forward.