Animation plays fine through animation scrubber: improperly when triggered by Animation Controller

I can scrub through an animation in the animation panel, but when I trigger that same animation through the animation controller, many elements don't animate.

Here's the Circumstance:

1 humanoid model with wings imported as FBX
5 animations of that model, all imported as FBX

Both the character and the animations for that character are being imported as humanoid.
Each animation has it's import parameters for Mask->Transform adjusted to include the wing bones.

On the surface, everything is fine, and everything works.
I can apply these animations to an animation controller, apply that controller to the primary model, and scrub/play the animations on my character in the animation panel.

The trouble is, when I press play and the game is actually running, when I trigger the animations, they no longer work properly. Several of the animations basically work, but others have elements of their animation ignored. I can pause the application and scrub the animations in the animation panel, and they work fine. Somehow, when triggered by the animation controller, they behave improperly.

I think this is probably a bug, but I was wondering if anyone else has encountered these sorts of problems before.

Thanks -Rory-

 

I have solved my problem, although I'm fairly sure I've also found a bug.

My issue can be corrected by having a new avatar for each of the animation clips being imported.
It seemed smarter to have the animation clips reference the avatar from the base model, but this appeared to have been causing severe animation artifacts where various joints would be ignored when triggered by the animation controller.