First Shadowheart could move normally, but couldn't fast travel. I read that this can happen if the game thinks she's still in jail, but she's never been jailed, nor has anyone else in the party. I resolved the issue by loading a save prior to the problem occurring.
Now Astarion is frozen in place, but can speak to my character and fast travel. On return to camp he doesn't go to his usual place in camp but stands at the loading spot near Karlach's tent (chapter 2 version of the camp). I might be able to find a save where this isn't a problem--or could just drop him from the active party since he was only on the mission because I thought he was overdue for an outing--but I'm wondering if I should just wait for a bugfix. Two such basic bugs within an hour and a half are pretty concerning. And no, Astarion is not encumbered. He doesn't even try to move.
Last edited by Imryll; 17/09/23 03:58 AM.