I think SR Amon is bugging out my team. Tried 3 times running ultimate on auto battle with her in my party and I get the unusable skill/eidolon bug during the 2nd to 3rd stage transition. Had to refresh browser every time. Swapped out Amon and it's back to working fine so far.

If it matters, I'm using Joan, Amaterasu, Brynhildr and Uriel. I had Amon but swapped her out for Nergal.

Anyone else experiencing similar issue?