Use WebGL: ReplaceColor while Sprite Opacity at 50%

It doesn't have to be 50%, but was trying to find the best way to explain in the title.

What's happening is that ReplaceColor is working great until I drop the Opacity of the sprite. Then it just isn't seeing the colors right anymore. I can put all of the sprites that will have colors replaced on the same layer and then lower the layer's opacity, but that might make what I want to do in the future tricky.

So, is there any way to use ReplaceColor and lower the Sprite's opacity?

I've attached a capx to test. If you change the sprite "Overlay"'s opacity to 100, it works great (press space bar to cycle through colors). If you lower the opacity at all, it doesn't work. Any help is greatly appreciated.

Capx https://drive.google.com/file/d/0B3dk7NNBQ1tZelpVY0t2QjFkX1k/edit?usp=sharing

Thanks,

Ben