Hey folks, searched for this and didn't see it so posting.
In skirmish, the power armor animation loops when ordered to crouch/uncrouch. It seems that it loops the last few frames after a move as well (twitching legs); curiously enough it seems that the head doesnt move but the rest of the armor does (i.e. you see the armor crouch and the head emerges afterwards) so I guess the actor crouches normally but the armor layer loops. This is on 2.4-dev March 19 w32 freshly installed on Win7x64, with GeForce 9600MGT (driver ver 8.17.12.6658)