I don't know how it was before the patch 1.07 but now i just can't start the quest, cannot start to talk to Vernon Roche.
Does any one know maybe how to fix it please?
It's been the same since v1.05 apparently - I'm stuck there too. Right now I'm re-applying the patch but I'm doubtful it will work. The reason is that (like me) you will have explored the cave earlier in your game. This means that the cutscene as you appraoch the cave doesnot play. I've been looking for a fix for it all day but got nothing. Some people say that the last patch (1.07) has fixed it for them, but mine is still bugged.
You can still do everything else, just can't finish the game.