Is anim a default Animation control (
https://wiki.esoui.com/Controls#AnimationManager -> AnimationObject e.g.) ?
Not sure if this could cause the crash but as it was a recent change about controls:
Did you try to set the DrawTier, layer and level of the animation control differently (higher) already? But it really would make me wonder if this would crash the client, e.g. if the texture control or animation is somehwere below any other...
Perhaps something that got to do with the recent 3d object changes.