I just did AC p3, and during the part where you change to ghosts, the skillbar arrows disappear even when out of combat and none of my teammates could change their skills, even in the Hero Panel. Apparently this happens when you change forms cause it just happened to someone else during the Inquest Fractal.
Screens for proof (not mine):
http://i.imgur.com/GvOId4V.png
http://i.imgur.com/BaaqJaI.jpg
