If you animate a cube in "Mode: Color" and the color is pure white "#FFFFFF", it turns the cube pitch black during animation. This is only visible while testing in-game, not in animation.
BUG Cube Color Turn Black in Anim.zip

Duplicate of #323

Use the Experimental Export option or
make a 0x0x0 sized cube that has all of the animations and don't animate the colored cube.