Transparency issue

OK folks.
I have an issue where I can only save out a rendered image as jpg in order to retain the visual look. If I render out with any alpha channel exr, tif, png I get the wrong result.
The image on the left is what we want but the image on the right is what we are getting when saved to file, even from the VFB. Whats also interesting is that it completely ignores the solid black tube that runs through the device. Only the outer shell has a misty blue plastic.
No render layers used. Maya 2018.3 not sure if this is the Nightly or latest. Where can I find the version n installed?

Any suggestions as to whats is going on here, I cant work it out.

Thanks for any help

OK solved, effect channels was set to color and alpha on the shader.