Skeletal mesh flickers (changes color) during animation seqence

Hey UE4 fam,

I have several doors in a scene that are imported animations (skeletal mesh + animation) from 3DS Max that simply open and close upon entry/exit of a proximity box. This is all working fine, however when the door opens/closes it briefly changes color (or shade) and then changes back again.

85014-flicker.gif

I previously had the doors animating via matinee and did not have this issue. Can anybody please help me fix this?