Substance plugin 4.27 swaps red & blue channels on base colour output when using image inputs

The Red and blue channels randomly switch when using the image input in the ue4 plugin. Can reliably recreate this with the image input but also sometimes occurs when using a multi switch for baked images & no image input. This happens even with the image input hooked directly to the base colour output node as well. 

Set up used for the below images:

We were able to test this by simply switching to the image input & back again causing it to go blue.

If I create a "MakeFloat4" node & swap the red/blue channels it outputs the intended base colour. 

This isn't a solution as when making other unrelated changes (e.g. texture resolution) & the texture updates everything & outputs the correct channels as intended originally so that change in the material would then make the texture go blue when working correctly. Any help greatly appreciated