I have the same problem as everyone else. My bar is blank all of a sudden and before it went blank I couldn't complete the ask the spirits about ambrosia task.. Maybe it's because I already had a pac...
Ideas
Adding some thoughts because I experienced the same thing but with different tasks. I was able to commune with the spirits (I think you can only do that if you have Paranormal) just fine. A lot of people are experiencing blank task bars and it seems to happen at random, no matter what task was being shown. So I don't think it's specifically the seance one.