I'm so frustrated with uv image/editor. I can't get my decal to show in render after editing the decal in gimp All I did was edit the texture in GIMP and now the decal texture won't show in my render.  I tried renaming... no go.  I spent half a day now trying to get it back.  





Any help would be greatly appreciated.  Here is my blend....  

https://drive.google.com/open?id=1T8I2Y8ZTdtWhvcV6k1s5m96fAVsQl4Nt

EDIT:  I'm an idiot.  I was working on an alternate node setup in the node editor that wasn't connected to a material output.  I didn't realize until I zoomed out and saw the real node setup.  It works as expected now.
I got it to show by simplifying the material and making sure I had a material output node. The use of the alpha here is a little confusing, but I suppose if you can get one showing and then use the alpha to set a separate shader of another color then you might work it out.