I went into Spellhold with Aerie in my party wielding the Staff of the Magi. She had Spell Trap cast when we went in. After Jon did his funky stuff and Bodhi gloated at me, Aerie was stood on the steps leading up into the dungeon, and was marked as part of the party but all her character screens were blanked out (as if she were unconscious/charmed/confused), and she couldn't be selected as a party member. I was able to remove her from the party, but couldn't then talk to her or interact in any way.
I fixed the problem by going back to the autosave before entering Spellhold, resting until Spell Trap wore off and then going in; Aerie was still in the same place, but I could select her as part of the group.
Has anyone else seen this sort of problem?