Generic Avatar in Mechanim...not working.

Well, I wouldn't have to ask this question if Unity gave some helpful info on Generic Avatars, but since it's scarce I have to ask here.

Basically I have a mesh that has around 5 bones, and I'm trying to use Mechanim with it. My main problem is that the avatar masks aren't working properly; nor are the animations. There really isn't much else to explain, I don't think. I've got an avatar, animator, 2D freeform directional...everything I usually use except with Humanoid avatars.

If anyone could help it's be very appreciated.

(I might seem a little frustrated--that's because I am, I've been trying to fix this for over an 1 1/2)