Blendshape added to idle and it plays, but the rest of my rig returns to mecanim muscle orientation

Hello,

I am adding a simple eyeblink blendshape to my Idle animation. I created it inside the Animation window and it played back as expected, but as soon as I launch the game, my character goes into that muscle-slider mecanim pose and hobbles around on the ground.

Any idea what I'm missing?

Edit: My character seems to be broken now. Re-importing or creating a fresh character doesn't fix anything. She's either sunken into the ground with the muscle pose or in a default pose where all animations only affect her by 50% and in an incorrect way. I've also removed the blink animation from the anim window and refreshed all her animations in the animator/blend trees to no effect.

Everything looks normal before I hit Play.

Edit: Fixed it. Think it was limited to my animator controller.