[Radek]

1. Check your special abilities. If you find something like "vampiric bite" then you get the answer for failing heal spells. The Vampirism trait might be scrolled out of the window (I am not sure where the trait is positioned on the list) but the abilities will always give you the answer. What did you tell Adrianna in the Skull Castle and what did you allow her?
2. The portals in the shrine. I have experienced "vanishing portals" there several times, too. You create a portal, the game tells you "portal created" but - when you attempt to teleport, the spell fizzles. It seems to be some kind of bug of the shrine. You should be able to create portals anywhere in the shrine. You should be able to teleport from anywhere to your portal. In fact, the only place in the game, where you CANNOT create a portal and, therefore, where you cannot teleport, is the Pyramid. You'd better do the following:
a) Make a special save.
b) Create portal.
c) Make a normal save.
d) Make a few steps away and teleport. Okay? The portal is ready and it will work everytime you cast teleport from anywhere. Reload the normal save and continue your way. Failure? You are a victim of the bug. Reload the special save and goto b).