Not sure how much info you may need, so I'll be sort of "anal retentive" and go into details.
Full dwarven party. M Paladin, M Battle Cleric, F Rogue and F Wizard.
Climbing down the ladder approaching the human who dies when you question him, the WIZ apparently started to fall off the ladder and the popup asked if I wanted to cast Feather Fall. I did.
Her animation did not fall and did not proceed down the ladder, but sort of stayed in place and appeared to climbing. The rest of the party continued down and approached the human they question.
The cut scene appeared, and there stands the wizard, beside the other 3, and looks like she is sort of drunk-ass dancing, doing the ladder climbing animation.
After the guy dies and you are returned to the game, she is still "dancing".
When I saved and tried to reload, it CTD.
When I restarted the game and again loaded the relevant save...it appears to be OK and the animation has stopped. That is the point I am currently at, so I can't say what is about to happen or not.