Hi @DRM ,
The adjusment is where you edit the colour, contrast etc in GIMP. For example, you can use the Colour curve for adjusting the curve. Don’t add drop down shadow, noise reduction, sharpening etc! That will spit out error and skew all the colour. Any video editor cannot read those filter, so be careful.
Have you made the visible layer? If not just right click at the image and add it first. Do all the adjustment within this layer only.
In G’mic just click the “preview” until you got the box. Sometimes you need to unthick and thick the preview several times. Don’t know why. That will ignore the two input process. Hope this helps.
In Shotcut set your white balance, exposure etc first and only add the LUT at the very end of your filter. The stack order is important sometimes.