Imported model partially disappears

I imported a rigged, animated model from Blender, and it worked perfectly using the Legacy animation system. Now, I’m trying to use the model with the Generic Mecanim system.

The model looks fine when I place it in the editor with no animator component, and even in the editor while the game isn’t playing. It also animates fine in the little preview window:

but when I actually run the game, almost all of the model disappears:

After trying a bunch of different FBX export settings in Blender, it now shows up, but when it goes to play a walk animation in game, all of the limbs bunch up and the torso flips over.

The part that’s there looks like it’s moving, but I have no idea why 90% of the model disappears.

Try to recalculate normal’s in blender. You can do this by going to mesh

Well, I did something that made it look right in game mode. I just changed the Animator layer’s blending from additive to override, and that stopped the model from clumping up weirdly.