On the Roche's route in the quest "Blood Curse" I can't go back from Vergen to continue game, teleport in the mist always takes me back to Vergen side.

Yes I have all three items (Banner, Sword from and Spearhead) and quest says to go back to kaedweni camp.

What I did to solve this problem:
- Reinstalled the game
- Reloaded earlier save twice. First time before going to the mist, second time before act 2, with making sure all active quests are either finished or progressed as far as possible.

I looked for answer online but somehow every time someone reports similar problem, it's either lack of some quest or need of game update/reinstall.

Any solutions?