Some things I don´t get:
The pillar to the portal of Isis seems to have stucked. Do I need to go there again? I´ve alredy got the obilisc and fixed the light.
What´s the Bridging Baboons for?
And last (for now hmmm)
In a room with a lever that don´t work and on the opposite side 2 stone faces, I guess I shall do something with them, but what!!

The pillar is a bug that is fixed by the patch. If you have the obelisk, and swam outside to the Leprechaun, and got the stone of clover then you have all you need - don't worry about it. Bridging baboons - there is an alcove between the pillar room and Anephas's altar that you are suposed to put them in (something about decorative monkeys by the narrator I think) - a few treasure rooms - Anephas's ashes possibly - or do you have those already??. By fixing the light do you mean that you have raised Anephas? The 2 stone faces thing I didn't get either. At one stage I had a small passage to what looked like a chest (random treasure I am told) - couldn't fit my pixie in there, played with some levers, then door shut and stone faces are inactive for me - not anything mind blowing in there that I am aware of.

The baboons fix a trap door that swings open if you don't put them in the alcove.